1.NounA gift beyond what is actually due; an addition or superfluity.
2.NounAn a fortiori occurrence, as a result of another effort without significant additional effort.
"Finally getting that cracked window fixed was a nice corollary of redoing the whole storefront."
3.NounA proposition which follows easily from the statement or 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."
4.AdjectiveOccurring as a natural consequence or result; attendant; consequential.
5.AdjectiveForming a proposition that follows from one already proved.