necessary

necessary
—necessariness, n.
/nes"euh ser'ee/, adj., n., pl. necessaries.
adj.
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.
a. (of a proposition) such that a denial of it involves a self-contradiction.
b. (of an inference or argument) such that its conclusion cannot be false if its supporting premises are true.
c. (of a condition) such that it must exist if a given event is to occur or a given thing is to exist. Cf. sufficient (def. 2).
n.
5. something necessary or requisite; 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 Eng. a privy or toilet.
[1300-50; ME necessarie < L necessarius unavoidable, inevitable, needful, equiv. to necess(e) (neut. indeclinable adj.) unavoidable, necessary + -arius -ARY]
Syn. 1. required, needed. NECESSARY, ESSENTIAL, INDISPENSABLE, REQUISITE indicate something vital for the fulfillment of a need. NECESSARY applies to that without which a condition cannot be fulfilled or to an inevitable consequence of certain events, conditions, etc.: Food is necessary to life. Multiplicity is a necessary result of division.
INDISPENSABLE applies to something that cannot be done without or removed from the rest of a unitary condition: Food is indispensable to living things. He made himself indispensable as a companion. That which is ESSENTIAL forms a vitally necessary condition of something: Air is essential to red-blooded animals. It is essential to understand the matter clearly. REQUISITE applies to what is thought necessary to fill out, complete, or perfect something: She had all the requisite qualifications for a position. 5. requirement, requisite, essential.
Ant. 1. dispensable.

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Universalium. 2010.

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Look at other dictionaries:

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  • Necessary — may refer to: Something that is a required condition for something else to be the case, see necessary and sufficient condition. A necessary truth, something that cannot fail to be true, see logical possibility. An important task or essential… …   Wikipedia

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  • Necessary — Nec es*sa*ry, n.; pl. {Necessaries}. 1. 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. [1913 Webster] 2. A… …   The Collaborative International Dictionary of English

  • necessary — [adj1] essential all important, basic, binding, bottom line*, cardinal, chief, compelling, compulsory, crucial, decisive, de rigueur*, elementary, exigent, expedient, fundamental, imperative, incumbent on, indispensable, mandatory, momentous,… …   New thesaurus

  • necessary — necessary/contingent truths …   Philosophy dictionary

  • necessary — 1 *needful, requisite, indispensable, essential Analogous words: compelling or compulsory, obliging or obligatory, constraining (see corresponding verbs at FORCE): important, significant, momentous (see corresponding nouns at IMPORTANCE):… …   New Dictionary of Synonyms

  • necessary — ne|ces|sa|ry1 W1S1 [ˈnesısəri US seri] adj [Date: 1300 1400; : Latin; Origin: necessarius, from necesse necessary , from ne not + cedere to give up ] 1.) something that is necessary is what you need to have or need to do →↑essential ▪ The booklet …   Dictionary of contemporary English

  • necessary — 1 adjective 1 something that is necessary is what you need to have or need to do; essential: I ll leave it to you to make all the necessary arrangements. (+ for): Food is necessary for life. | it is necessary (for sb) to do sth: It s not… …   Longman dictionary of contemporary English

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