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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
Something indispensable.

[Middle English necessarie, from Old French necessaire, from Latin necessārius, from necesse; see ked- in Indo-European roots.]


pl n
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
References in classic literature ?
Meg went to the other window, and sewed as if new rosettes for slippers were among the necessaries of life.
The boats were here hailed, to tow the whale on the larboard side, where fluke chains and other necessaries were already prepared for securing him.
Then there was a black bonnet which had to be adjusted carefully, and an umbrella which was mislaid, and a bag full of necessaries which had to be collected from here and there--the man being nearly crazy with anxiety in the meantime.