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Definitions for Necessary

[1] being essential, indispensable, or requisite: a necessary part of the motor.
[2] happening or existing by necessity: a necessary change in our plans.
[3] acting or proceeding from compulsion or necessity; not free; involuntary: a necessary agent.
[4] Logic . (of a proposition) such that a denial of it involves a self-contradiction. (of an inference or argument) such that its conclusion cannot be false if its supporting premises are true. (of a condition) such that it must exist if a given event is to occur or a given thing is to exist. Compare sufficient(def 2) .
[5] something necessary or required for a particular purpose; necessity.
[6] necessaries, Law . food, clothing, etc., required by a dependent or incompetent and varying with his or her social or economic position or that of the person upon whom he or she is dependent.
[7] Chiefly New England . a privy or toilet.
[8] needed to achieve a certain desired effect or result; required
[9] resulting from necessity; inevitable the necessary consequences of your action
[10] logic (of a statement, formula, etc) true under all interpretations or in all possible circumstances (of a proposition) determined to be true by its meaning, so that its denial would be self-contradictory (of a property) essential, so that without it its subject would not be the entity it is (of an inference) always yielding a true conclusion when its premises are true; valid (of a condition) entailed by the truth of some statement or the obtaining of some state of affairs Compare sufficient (def. 2)
[11] philosophy (in a nonlogical sense) expressing a law of nature, so that if it is in this sense necessary that all As are B, even although it is not contradictory to conceive of an A which is not B, we are licensed to infer that if something were an A it would have to be B
[12] rare compelled, as by necessity or law; not free
[13] the necessary informal the money required for a particular purpose
[14] do the necessary informal to do something that is necessary in a particular situation

Words related to Necessary

unavoidable, mandatory, fundamental, urgent, indispensable, required, crucial, needed, vital, imperative, significant, basic, paramount, decisive, imminent, certain, prime, binding, chief, pressing

Words nearby Necessary

necator, necatoriasis, necessarian, necessaries, necessarily, necessary, necessary condition, necessary stool, necessitarian, necessitarianism, necessitate

Origin of Necessary

1300–50; Middle English necessarie < Latin necessārius unavoidable, inevitable, needful, equivalent to necess(e ) (neuter indeclinable adj.) unavoidable, necessary + -ārius -ary

Words that may be confused with Necessary

necessary, necessitous, (see, synonym, study, at, the, current, entry)

Other words from Necessary

nec·es·sar·i·ness , noun
qua·si-nec·es·sar·y , adjective

Word origin for Necessary

C14: from Latin necessārius indispensable, from necesse unavoidable

Synonyms for Necessary

basic, crucial, decisive, fundamental, imperative, indispensable, mandatory, needed, paramount, required, significant, unavoidable, urgent, vital, binding, cardinal, chief, expedient, prerequisite, pressing, prime, principal, requisite, all-important, bottom-line, compelling, compulsory, de rigueur, elementary, exigent, incumbent on, momentous, name of game, needful, obligatory, quintessential, specified, wanted