Definitions from Wiktionary ( )

▸ adjective:  Similar or identical in value, meaning or effect; virtually equal.
▸ adjective:  (mathematics) Of two sets, having a one-to-one correspondence.
▸ adjective:  (mathematics) Relating to the corresponding elements of an equivalence relation.
▸ adjective:  (chemistry) Having the equal ability to combine.
▸ adjective:  (cartography) Of a map, equal-area.
▸ adjective:  (geometry) Equal in measure but not admitting of superposition; applied to magnitudes.
▸ noun:  Anything that is virtually equal to something else, or has the same value, force, etc.
▸ noun:  (chemistry) An equivalent weight.
▸ verb:  (transitive) To make equivalent to; to equal.

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