1. A kind of macro in source code that replaces one text string with another wherever it occurs.


  1. To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly.
  2. To settle, decide (an argument etc.).
  3. To express the essential nature of something.
  4. To state the meaning of a word, phrase, sign, or symbol.
  5. To describe, explain, or make definite and clear.
  6. To demark sharply the outlines or limits of an area or concept.
  7. To establish the referent of a term or notation.

The above text is a snippet from Wiktionary: define
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