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adj. 1. Needed or required: a contract complete with the necessary signatures; conditions necessary to life. See Synonyms at indispensable. 2. a. Unavoidably determined by prior conditions or circumstances; inevitable: the necessary results of overindulgence. b. Logically inevitable: a necessary conclusion. 3. Required by obligation, compulsion, or convention: made the necessary apologies. n. pl. nec·es·sar·ies Something indispensable. [Middle English necessarie, from Old French necessaire, from Latin necessārius, from necesse; see ked- in the Appendix of Indo-European roots.] |
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