Com"ple*ment (?), n. [L. complementun: cf. F. complÚment. See Complete, v. t., and cf. Compliment.] 1. That which fills up or completes; the quantity or number required to fill a thing or make it complete.
2. That which is required to supply a deficiency, or to complete a symmetrical whole.
History is the complement of poetry.
Sir J. Stephen.