Definitions from Wiktionary (define)

▸ verb:  To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly.
▸ verb:  (obsolete) To settle, decide (an argument etc.)
▸ verb:  To express the essential nature of something.
▸ verb:  To state the meaning of a word, phrase, sign, or symbol.
▸ verb:  To describe, explain, or make definite and clear; used to request the listener or other person to elaborate or explain more clearly his or her intended meaning of a word or expression.
▸ verb:  To demark sharply the outlines or limits of an area or concept.
▸ verb:  (mathematics) To establish the referent of a term or notation.
▸ noun:  (programming) A kind of macro in source code that replaces one text string with another wherever it occurs.

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