MPC § 1.13: General Definitions
What does General Definitions (Model Penal Code) provide?
Section 1.13 provides the foundational definitions used throughout the Model Penal Code. It defines critical terms such as "element of an offense" (which includes conduct, attendant circumstances, and results of conduct), "material element" (an element that does not relate exclusively to statute of limitations, jurisdiction, venue, or similar procedural matters), and "act" or "action" (a bodily movement whether voluntary or involuntary). The section also defines "voluntary" as distinct from reflexive or convulsive movement.
Source: Model Penal Code § 1.13
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Summary
Section 1.13 provides the foundational definitions used throughout the Model Penal Code. It defines critical terms such as "element of an offense" (which includes conduct, attendant circumstances, and results of conduct), "material element" (an element that does not relate exclusively to statute of limitations, jurisdiction, venue, or similar procedural matters), and "act" or "action" (a bodily movement whether voluntary or involuntary). The section also defines "voluntary" as distinct from reflexive or convulsive movement.
The definitions in Section 1.13 are essential because they establish the vocabulary that the rest of the MPC relies upon. For instance, the definition of "element of an offense" directly connects to Section 2.02's culpability requirements, which attach to each material element. The section also defines "purposely," "knowingly," "recklessly," and "negligently" by cross-reference to Section 2.02, creating a unified terminological framework.
Other important definitions include "conduct" (an action or omission and its accompanying state of mind), "offense" (a violation of any penal statute), "reasonably believes" (a belief the actor is not reckless or negligent in holding), and "situation" (used in the context of negligence and recklessness standards). These definitions eliminated much of the ambiguity that plagued common law criminal statutes.
Key Provisions
5 essential provisions of § 1.13
"Element of an offense" includes conduct, attendant circumstances, or result of conduct that is included in the description of the forbidden behavior
"Material element" excludes elements relating only to jurisdiction, venue, or statute of limitations
"Act" means a bodily movement whether voluntary or involuntary
"Voluntary" excludes reflex or convulsion, bodily movement during unconsciousness or sleep, conduct during hypnosis, and any movement not a product of effort or determination
"Reasonably believes" means a belief the actor is not reckless or negligent in holding
MPC vs. Common Law
How the MPC approach to general definitions differs from common law
At common law, criminal terms were defined inconsistently across jurisdictions, leading to confusion about mens rea requirements, actus reus elements, and the scope of offenses. The MPC's definitional section was a deliberate attempt to create precision where common law had ambiguity. For example, common law often conflated "intent" with "purpose" and "knowledge," while the MPC carefully distinguishes between these concepts. The common law also lacked a standard definition of "voluntary act" — some jurisdictions treated it as conscious physical movement, while others included habitual acts. The MPC's definition is narrower and more precise, explicitly excluding reflexes, convulsions, and movements during unconsciousness.
Exam Relevance
How § 1.13 appears on criminal law exams
Section 1.13 definitions appear on exams primarily through their connection to other MPC provisions. Professors test whether students understand that culpability under Section 2.02 attaches to each "material element" of an offense, making the 1.13 definition of that term critical. A common exam pattern presents a statute and asks students to identify the material elements and determine which culpability level applies to each. Students should also know the definition of "voluntary" for actus reus analysis, as it connects directly to Section 2.01. The definitions section is also tested indirectly through hypotheticals involving mistake (Section 2.04), where the concept of "element of an offense" determines whether a mistake negates a required mental state.
Related Sections
Sections frequently studied alongside § 1.13