• That which is permanent or invariable.
  • A quantity that remains at a fixed value throughout a given discussion.
  • Any property of an experiment, determined numerically, that does not change under given circumstances.
  • An identifier that is bound to an invariant value; a fixed value given a name to aid in readability of source code.


  • From Middle English constant, from Old French constant, from Latin constantem, accusative of constans, from constare. Displaced native .

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