adjective Similar or identical in value, meaning or effect; virtually equal.
To burn calories, a thirty-minute jog is equivalent to a couple of hamburgers.
adjective Of two sets, having a one-to-one correspondence.
adjective Relating to the corresponding elements of an equivalence relation.
adjective Of two categories, (informally) such that one is essentially a relabeling of the other; (formally) related by a pair of functors such the composition of the one with the other is naturally isomorphic to the identity functor.
adjective Having the equal ability to combine.
adjective Of a map, equal-area.
adjective Equal in measure but not admitting of superposition; applied to magnitudes.
A square may be equivalent to a triangle.
noun Anything that is virtually equal to something else, or has the same value, force, etc.
He's the Italian equivalent of a district attorney.