Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not changing or subject to change; constant.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not variable; that always has the same value in different occurrences.
  • adj. constant.
  • adj. That cannot undergo inflection, conjugation or declension.
  • n. Something that does not vary; a constant.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not given to variation or change; unalterable; unchangeable; always uniform.
  • n. An invariable quantity; a constant.

from The Century Dictionary and Cyclopedia

  • Not variable; constant; uniform; unchanging.
  • Not capable of being varied; unalterable; unchangeable.
  • n. In mathematics, a quantity that does not vary; a constant.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. not liable to or capable of change
  • n. a quantity that does not vary

Etymologies

in- +‎ variable (Wiktionary)

Examples

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