noun

• (semantics, lexicography) A statement of the meaning of a word or word group or a sign or symbol (dictionary definitions).
• (usually with the definite article the) A clear instance conforming to the dictionary or textbook definition.
• A statement expressing the essential nature of something; formulation
• The action or process of defining.
• The act of defining; determination of the limits.
• A product of defining.
• The action or power of describing, explaining, or making definite and clear.
• Clarity of visual presentation, distinctness of outline or detail.
• Clarity, especially of musical sound in reproduction.
• Sharp demarcation of outlines or limits.
• (bodybuilding) The degree to which individual muscles are distinct on the body.
• (programming) A statement which provides a previous declaration with a value or body of a subroutine (in the case of function).
• (mathematics) A statement that establishes the referent of a term or notation.