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Definition of necessary : 1. A privy; a water- closet.
2. A thing that is necessary or indispensable to some purpose; something that one can not do without; a requisite; an essential; - used chiefly in the plural; as, the necessaries of life.
3. Acting from necessity or compulsion; involuntary; - opposed to free; as, whether man is a necessary or a free agent is a question much discussed.
4. Impossible to be otherwise, or to be dispensed with, without preventing the attainment of a desired result; indispensable; requiste; essential.
5. Such as must be; impossible to be otherwise; not to be avoided; inevitable.
6. Such things, in respect to infants, lunatics, and married women, as are requisite for support suitable to station.

Synonyms:

ingrained, specified, assured, principal, undeniable, wanted, prime, decisive, infallible, elementary, unessential, imminent, obligation, cardinal, momentous, necessity, expedient, fixed, urgent, exigent, unimportant, determinate, innate, paramount, needed, important, permanent, fundamental, constant, unavoidable, requirement, vital, needful, inherent, demand, basic, significant, chief, crucial, intrinsic, certain, quintessential

imperative, compulsory, required, inevitable, pressing, mandatory, constraining, obligatory, indispensable, binding, requisite

prerequisite, involuntary, proviso, stipulated, inexorable, must, inescapable, essential

Usage examples:

• All that is more than necessary is too much. - "Clarissa, Volume 5 (of 9)", Samuel Richardson.
• She herself alone was necessary to him. - "The Lion's Share", E. Arnold Bennett.
• But we will spare what is necessary for her. - "In The Fire Of The Forge, Volume 7.", Georg Ebers.