(philosophy) A word or expression capable of different meanings; an ambiguous term.

Similar or identical in value, meaning or effect; virtually equal. / (mathematics) Of two sets, having a one-to-one correspondence.

Anything that is virtually equal to something else, or has the same value, force, etc. / (chemistry) An equivalent weight.

(transitive) To make equivalent to; to equal.

(economics) The measure of how much money a consumer would pay before a price increase, to avoid the price increase.

(uncountable) The condition of being equivalent or essentially equal. / (countable, mathematics) An equivalence relation; ≡; ~

(transitive) To be equivalent or equal to; to counterbalance.

(intransitive) To speak using double meaning; to speak ambiguously, unclearly or doubtfully, with intent to deceive. / (transitive) To render equivocal or ambiguous.

(set theory) Any one of the subsets into which an equivalence relation partitions a set, each of these subsets containing all the elements of the set that are equivalent under the equivalence relation.

(set theory) A binary relation that is reflexive, symmetric and transitive.