corollary

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.

• corollary in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• corollary in The Century Dictionary, New York, N.Y.: The Century Co., 1911.