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

  • adj. Having or expressing a meaning; meaningful.
  • adj. Having or expressing a covert meaning; suggestive: a significant glance. See Synonyms at expressive.
  • adj. Having or likely to have a major effect; important: a significant change in the tax laws.
  • adj. Fairly large in amount or quantity: significant casualties; no significant opposition.
  • adj. Statistics Of or relating to observations or occurrences that are too closely correlated to be attributed to chance and therefore indicate a systematic relationship.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Signifying something; carrying meaning.
  • adj. Having a covert or hidden meaning
  • adj. Having a noticeable or major effect; notable
  • adj. Reasonably large in number or amount
  • adj. Having a low probability of occurring by chance (for example, having high correlation and thus likely to be related).
  • n. That which has significance; a sign; a token; a symbol.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Fitted or designed to signify or make known somethingl having a meaning; standing as a sign or token; expressive or suggestive.
  • adj. Deserving to be considered; important; momentous.
  • n. That which has significance; a sign; a token; a symbol.

from The Century Dictionary and Cyclopedia

  • Signifying something; conveying a meaning; having a purport; expressive; implying some character, and not merely denotative: as, a significant word or sound.
  • Serving as a sign or indication; having a special or covert meaning; suggestive; meaning: as, a significant gesture; a significant look.
  • Important; notable; weighty; more strictly, important for what it indicates, but also, often, important in its consequences: opposed to insignificant: as, a significant event.
  • n. That which is significant; a meaning, sign, or indication.

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

  • adj. too closely correlated to be attributed to chance and therefore indicating a systematic relation
  • adj. important in effect or meaning
  • adj. fairly large
  • adj. rich in significance or implication


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

Latin significāns, significant-, present participle of significāre, to signify; see signify.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin significans, present participle of significare, from signum, "sign", + ficare, "do" or "make", variant of facere.


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