OPINION ON APPELLANT’S PETITION FOR DISCRETIONARY REVIEW
MALONEY, Judge.
Appellant was convicted by a jury of the offense of aggravated robbery and sentenced to fifty years’ confinement. Appellant’s conviction was affirmed by the Fifth District Court of Appeals. Alford v. State, 806 S.W.2d 581 (Tex.App.-Dallas 1991). We granted appellant’s petition for discretionary review, pursuant to Tex.R.App.P. 200(c)(2), to address whether the Court of Appeals erred in holding that the trial court, by placing on appellant the burden of proving the affirmative defense of duress, did not violate due [621]*621process of law as guaranteed by the Fourteenth Amendment to the United States Constitution.1
Appellant testified at trial that his participation in the instant offense was compelled by threats from his cohort of imminent death or serious bodily injury. The trial court’s charge instructed the jury that an offense is committed only if the offender acts voluntarily. The charge further instructed the jury that appellant bore the burden of proving the affirmative defense of duress by a preponderance of the evidence.2 Appellant objected to the charge as violating due process under the Fourteenth Amendment, claiming the charge delegated a burden of proof to both parties on the same issue by requiring the State to prove voluntariness beyond a reasonable doubt, yet requiring appellant, in proving duress, to establish that his actions were involuntary by a preponderance of the evidence.3 Appellant’s objections were overruled.
Relying in part on the Supreme Court’s “willingness to give state legislatures considerable leeway in defining defenses to crimes”, id. at 588 (citing Patterson v. New York, 432 U.S. 197, 97 S.Ct. 2319, 53 L.Ed.2d 281 (1977)), the Court of Appeals held that the shifting of the burden of proof4 to appellant to prove duress did not violate due process. Alford, 806 S.W.2d at 589. While the Court of Appeals’ efforts in analyzing the burden of proof issue are commendable, it overlooked the threshold issue regarding the meaning of the term “voluntarily”. Based upon our interpretation of that term as follows, we will affirm.
Whether or not proof of duress negates the issue of voluntariness turns upon the meaning of the term “voluntarily” as it is utilized in section 6.01(a) of the Penal Code. Section 6.01(a) of the Penal Code provides that:
A person commits an offense only if he voluntarily engages in conduct, including an act, an omission, or possession.
TexPenal Code Ann. § 6.01(a). If volun-tariness embraces only a physical element, in the sense of one’s bodily movements, then the issue of duress would have no bearing on the issue of voluntariness unless the coerced actor claims his bodily movements in committing the crime were not controlled through his own efforts, which appellant does not [622]*622contend. However, if voluntariness includes a mental element, in the nature of free will, then the issue of duress may bear upon the issue of voluntariness. Appellant’s arguments assume that voluntariness incorporates such a mental element. However, the traditional view of criminal responsibility as comprised of an act and a mental state, the embodiment of that concept within the scheme of Chapter 6, and our view of the role of section 6.01(a) to date, support the conclusion that the term “voluntarily”, as used in section 6.01(a), does not include the concept of free will.
It is settled law that criminal liability must be supported by proof of both a criminal act and a culpable mental state. Tex.Penal Code Ann. § 6.01 Practice Commentary (1974); Model Penal Code § 2.01 Comment. This rudimentary concept is reflected in Chapter 6 of the Texas Penal Code,5 with section 6.01 providing for voluntary act, and 6.02 requiring culpable mental state. See Alvarado v. State, 704 S.W.2d 36, 38 (Tex.Crim.App.1985) (opinion on reh’g) (recognizing that the significance of section 6.01(a) in context of Chapter 6 is that it “distinguishes culpable mental states from the requirement of voluntary conduct”); see also Tex.Penal Code Ann. § 6.01 Practice Commentary (1974) (“[s]ubseetion (a) codifies the first part of elementary rule requiring a voluntary act or omission as a predicate to criminal responsibility”); TEXAS ANNOTATED PENAL STATUTES § 6.01, Explanatory Comment 232 (Branch’s 3rd ed. 1974) (“a voluntary act [under section 6.01(a) ] — be it speech, possession, or bodily movement plus the mens rea requirement in violation of a statutory prohibition — is necessary before a person’s conduct is criminal”). We have viewed section 6.01(a) as imposing an actus element of criminal liability onto every offense:
[a]n additional significance of § 6.01 in the instant case is that it superimposes an “engage in conduct” requirement onto every offense; this, however, is relevant to the voluntariness of acts or omissions, and not the subject of culpable mental state.
Alvarado, 704 S.W.2d at 38. Although it is clear that section 6.01(a) embodies the elemental principle that criminal responsibility arises in part from an act, it is less clear how the term “voluntarily” effects that principle.
On occasions when we have addressed the term “voluntarily” as utilized in section 6.01(a), we have viewed it as meaning the converse of accidentally. See, e.g., George v. State, 681 S.W.2d 43 (Tex.Crim.App.1984); Williams v. State, 630 S.W.2d 640 (Tex.Crim.App.1982) (opinion on reh’g); Dockery v. State, 542 S.W.2d 644, 649 (Tex.Crim.App.1975) (opinion on reh’g). For instance, in Dockery we said:
It is clear [ ] that a homicide may still be accidental under our new Penal Code.... By enacting this section [6.01(a)] the Legislature intended to assure that persons not be criminally punished for acts, omissions, and possessions not done voluntarily. Therefore, if a homicide is not the result of voluntary conduct, it may not be criminally punished.
However, it is also clear that such a homicide must be accompanied by one of the four culpable mental states, [citations omitted]
We conclude, therefore, that homicide is punishable only where the State proves both voluntary conduct and a culpable mental state.
Dockery, 542 S.W.2d at 649-50 (emphasis added). Likewise, in Williams, where the defendant objected to the charge for its failure to instruct on the defense of accident, we said:
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OPINION ON APPELLANT’S PETITION FOR DISCRETIONARY REVIEW
MALONEY, Judge.
Appellant was convicted by a jury of the offense of aggravated robbery and sentenced to fifty years’ confinement. Appellant’s conviction was affirmed by the Fifth District Court of Appeals. Alford v. State, 806 S.W.2d 581 (Tex.App.-Dallas 1991). We granted appellant’s petition for discretionary review, pursuant to Tex.R.App.P. 200(c)(2), to address whether the Court of Appeals erred in holding that the trial court, by placing on appellant the burden of proving the affirmative defense of duress, did not violate due [621]*621process of law as guaranteed by the Fourteenth Amendment to the United States Constitution.1
Appellant testified at trial that his participation in the instant offense was compelled by threats from his cohort of imminent death or serious bodily injury. The trial court’s charge instructed the jury that an offense is committed only if the offender acts voluntarily. The charge further instructed the jury that appellant bore the burden of proving the affirmative defense of duress by a preponderance of the evidence.2 Appellant objected to the charge as violating due process under the Fourteenth Amendment, claiming the charge delegated a burden of proof to both parties on the same issue by requiring the State to prove voluntariness beyond a reasonable doubt, yet requiring appellant, in proving duress, to establish that his actions were involuntary by a preponderance of the evidence.3 Appellant’s objections were overruled.
Relying in part on the Supreme Court’s “willingness to give state legislatures considerable leeway in defining defenses to crimes”, id. at 588 (citing Patterson v. New York, 432 U.S. 197, 97 S.Ct. 2319, 53 L.Ed.2d 281 (1977)), the Court of Appeals held that the shifting of the burden of proof4 to appellant to prove duress did not violate due process. Alford, 806 S.W.2d at 589. While the Court of Appeals’ efforts in analyzing the burden of proof issue are commendable, it overlooked the threshold issue regarding the meaning of the term “voluntarily”. Based upon our interpretation of that term as follows, we will affirm.
Whether or not proof of duress negates the issue of voluntariness turns upon the meaning of the term “voluntarily” as it is utilized in section 6.01(a) of the Penal Code. Section 6.01(a) of the Penal Code provides that:
A person commits an offense only if he voluntarily engages in conduct, including an act, an omission, or possession.
TexPenal Code Ann. § 6.01(a). If volun-tariness embraces only a physical element, in the sense of one’s bodily movements, then the issue of duress would have no bearing on the issue of voluntariness unless the coerced actor claims his bodily movements in committing the crime were not controlled through his own efforts, which appellant does not [622]*622contend. However, if voluntariness includes a mental element, in the nature of free will, then the issue of duress may bear upon the issue of voluntariness. Appellant’s arguments assume that voluntariness incorporates such a mental element. However, the traditional view of criminal responsibility as comprised of an act and a mental state, the embodiment of that concept within the scheme of Chapter 6, and our view of the role of section 6.01(a) to date, support the conclusion that the term “voluntarily”, as used in section 6.01(a), does not include the concept of free will.
It is settled law that criminal liability must be supported by proof of both a criminal act and a culpable mental state. Tex.Penal Code Ann. § 6.01 Practice Commentary (1974); Model Penal Code § 2.01 Comment. This rudimentary concept is reflected in Chapter 6 of the Texas Penal Code,5 with section 6.01 providing for voluntary act, and 6.02 requiring culpable mental state. See Alvarado v. State, 704 S.W.2d 36, 38 (Tex.Crim.App.1985) (opinion on reh’g) (recognizing that the significance of section 6.01(a) in context of Chapter 6 is that it “distinguishes culpable mental states from the requirement of voluntary conduct”); see also Tex.Penal Code Ann. § 6.01 Practice Commentary (1974) (“[s]ubseetion (a) codifies the first part of elementary rule requiring a voluntary act or omission as a predicate to criminal responsibility”); TEXAS ANNOTATED PENAL STATUTES § 6.01, Explanatory Comment 232 (Branch’s 3rd ed. 1974) (“a voluntary act [under section 6.01(a) ] — be it speech, possession, or bodily movement plus the mens rea requirement in violation of a statutory prohibition — is necessary before a person’s conduct is criminal”). We have viewed section 6.01(a) as imposing an actus element of criminal liability onto every offense:
[a]n additional significance of § 6.01 in the instant case is that it superimposes an “engage in conduct” requirement onto every offense; this, however, is relevant to the voluntariness of acts or omissions, and not the subject of culpable mental state.
Alvarado, 704 S.W.2d at 38. Although it is clear that section 6.01(a) embodies the elemental principle that criminal responsibility arises in part from an act, it is less clear how the term “voluntarily” effects that principle.
On occasions when we have addressed the term “voluntarily” as utilized in section 6.01(a), we have viewed it as meaning the converse of accidentally. See, e.g., George v. State, 681 S.W.2d 43 (Tex.Crim.App.1984); Williams v. State, 630 S.W.2d 640 (Tex.Crim.App.1982) (opinion on reh’g); Dockery v. State, 542 S.W.2d 644, 649 (Tex.Crim.App.1975) (opinion on reh’g). For instance, in Dockery we said:
It is clear [ ] that a homicide may still be accidental under our new Penal Code.... By enacting this section [6.01(a)] the Legislature intended to assure that persons not be criminally punished for acts, omissions, and possessions not done voluntarily. Therefore, if a homicide is not the result of voluntary conduct, it may not be criminally punished.
However, it is also clear that such a homicide must be accompanied by one of the four culpable mental states, [citations omitted]
We conclude, therefore, that homicide is punishable only where the State proves both voluntary conduct and a culpable mental state.
Dockery, 542 S.W.2d at 649-50 (emphasis added). Likewise, in Williams, where the defendant objected to the charge for its failure to instruct on the defense of accident, we said:
There is no law and defense of accident in the present penal code, and the bench and bar would be well advised to avoid the term “accident” in connection with offenses defined by the present penal code. The function of the former defense of accident is performed now by the requirement of V.T.C.A, Penal Code, Section 6.01(a), that “A person commits an offense if he voluntarily engages in conduct....” [citation [623]*623omitted] If the issue is raised by the evidence, a jury may be charged that a defendant should be acquitted if there is a reasonable doubt as to whether he voluntarily engaged in the conduct of which he is accused.
Williams, 630 S.W.2d at 644 (emphasis added). Therefore, to date, section 6.01(a) has been viewed by this Court as providing for the act element of criminal liability and as incorporating the notion that one will not be subjected to criminal liability for an accidental act. We are not persuaded that the Legislature intended section 6.01(a) to embody any broader meaning.6
The Code does not define the term “voluntarily5’. We recently addressed the interpretation of specific words used in statutes:
... in determining the meaning of a word in a statute, “the inquiry is not as to its abstract meaning, but as to the sense in which it is used when the legislative purpose so requires.” [citation omitted] Typically, a word is construed according to its plain meaning, but a word may be given a broader or a narrower meaning than that which it has in ordinary usage, [citation omitted] The principle rule is that a statute, when susceptible to more than one construction, will be interpreted so as to secure the purpose or benefit intended.
Ward v. State, 829 S.W.2d 787, 791 (Tex.Crim.App.1992). Webster’s definition of the term “voluntary” includes at least eight variations, some of which are considerably broader than others and many of which equate intentional conduct with voluntary conduct.7 [624]*624Although most of these variations incorporate a concept of free will, we think a narrower construction is more consistent with the likely intention of the Legislature in light of the function of section 6.01(a), as discussed above. In the absence of evidence that the Legislature intended the term “voluntarily” to be given such a broad definition, we will not construe it in that manner. Rather, we hold that the term “voluntarily” as utilized in section 6.01(a) means the absence of an accidental act, omission or possession.
Appellant claims that the charge improperly delegated a burden of proof to both parties on the same issue by requiring the State to prove voluntariness beyond a reasonable doubt, while requiring appellant, in proving duress, to establish that his actions were involuntary by a preponderance of the evidence. In light of the meaning of voluntariness as we have herein defined it, appellant’s argument is without merit. Vol-untariness, within the meaning of section 6.01(a), refers only to one’s physical bodily movements. Appellant does not claim that his bodily movements were accidental or manipulated by his coercer. Therefore, in attempting to prove duress, appellant was not required to disprove voluntariness.8 Rather, appellant was required to prove that he committed the offense because of the coercive elements set forth in section 8.05.9
[625]*625The judgment of the Court of Appeals is affirmed.
OVERSTREET, J., concurs in the result.