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

  • adj. Capable of or subject to change or alteration.
  • adj. Prone to frequent change; inconstant: mutable weather patterns.
  • adj. Tending to undergo genetic mutation: a mutable organism; a mutable gene.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Changeable; inclined to mutate.
  • adj. Having a value that is changeable during program execution.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Capable of alteration; subject to change; changeable in form, qualities, or nature.
  • adj. Changeable; inconstant; unsettled; unstable; fickle.

from The Century Dictionary and Cyclopedia

  • Capable of being altered in form, qualities, or nature; subject to change; changeable.
  • Changeable or inconstant in mind or feelings; unsettled; unstable; liable to change.
  • Synonyms Alterable.
  • Unsteady, wavering, variable, irresolute, fickle, vacillating.

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

  • adj. capable of or tending to change in form or quality or nature


Middle English, from Latin mūtābilis, from mūtāre, to change; see mutate.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin mutabilis ("liable to change"); mutate +‎ -able. (Wiktionary)



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