corollary /ˈkɔɹəˌlɛɹi/noun 3adjective 2forms 1 noun3 •An 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. •A 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. •A gift beyond what is actually due; an addition or superfluity. adjective2 •Occurring as a natural consequence or result; attendant; consequential. •(rare) Forming a proposition that follows from one already proved. formscorollaries