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1. Needed or required: a contract complete with the necessary signatures; conditions necessary to life. See Synonyms at indispensable.
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
1. (sometimes singular) what is needed; essential items: the necessaries of life.
2. (Law) law food, clothing, etc, essential for the maintenance of a dependant in the condition of life to which he or she is accustomed