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A legal definition of a word is the precise, binding meaning assigned to a term by statutory law, judicial precedent, or authoritative legal dictionaries. Unlike colloquial or dictionary definitions, which reflect everyday usage and evolve organically, a legal definition is intentionally rigid, narrow, and codified to ensure absolute clarity and predictability within the justice system.

When legislators draft laws, they often include a definitions section to explicitly state how specific words must be interpreted throughout that entire statute. This prevents ambiguity and misinterpretation during enforcement or litigation.

For instance, while a common dictionary might define a vehicle broadly, a specific transportation statute might legally define it to exclude bicycles or aircraft. Ultimately, legal definitions of words establish a uniform standard of meaning, ensuring that individuals, law enforcement, and courts interpret and apply the law exactly as intended, minimizing subjective guesswork.