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From Middle English, from Late Latin corōllārium (money paid for a garland; gift, gratuity, something extra; consequence, deduction), from corōlla (small garland), diminutive of corōna (crown).


  • IPA(key): /kɒˈɹɒləɹi/, /ˈkɒɹələɹi/
  • (US) enPR: kôr'əlĕrē, IPA(key): /ˈkɔɹəˌlɛɹi/


corollary (plural corollaries)

  1. Something given beyond what is actually due; something added or superfluous.
  2. Something which occurs a fortiori, as a result of another effort without significant additional effort.
    Finally getting that cracked window fixed was a nice corollary of redoing the whole storefont.
  3. (mathematics, logic) A proposition which follows easily from the proof of another proposition.
    We have proven that this set is finite and well ordered; as a corollary, we now know that there is an order-preserving map from it to the natural numbers.



corollary (not comparable)

  1. (rare) Forming a proposition that follows from one already proved.

Further reading[edit]