Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Not changing or subject to change; constant.

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Not given to variation or change; unalterable; unchangeable; always uniform.
  • noun (Math.) An invariable quantity; a constant.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Not variable; that always has the same value in different occurrences.
  • adjective mathematics constant.
  • adjective by extension, grammar, of a word That cannot undergo inflection, conjugation or declension.
  • noun Something that does not vary; a constant.

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

  • adjective not liable to or capable of change
  • noun a quantity that does not vary

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

in- +‎ variable

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