Similar or identical in value, meaning or effect; virtually equal

• His request was equivalent to an order.

  Tatoeba · CK · CC BY 2.0 FR

Of two sets, having a one-to-one correspondence

Relating to the corresponding elements of an equivalence relationrare

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 functorrare

Having the equal ability to combinerare

Of a map, equal-arearare

Equal in measure but not admitting of superposition; applied to magnitudesrare

Anything that is virtually equal to something else, or has the same value, force, etc

• Give me the equivalent in dollars.

  Tatoeba · _undertoad · CC BY 2.0 FR

• That French word has no equivalent in English.

  Tatoeba · CK · CC BY 2.0 FR

An equivalent weightrare