[ nes-uh-ser-ee ]
/ ˈnɛs əˌsɛr i /
being essential, indispensable, or requisite: a necessary part of the motor.
happening or existing by necessity: a necessary change in our plans.
acting or proceeding from compulsion or necessity; not free; involuntary: a necessary agent.
- (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).
noun, plural nec·es·sar·ies.
something necessary or required for a particular purpose; necessity.
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.
Chiefly New England. a privy or toilet.
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Origin of necessary
1300–50; Middle English necessarie < Latin necessārius unavoidable, inevitable, needful, equivalent to necess(e) (neuter indeclinable adj.) unavoidable, necessary + -ārius -ary
SYNONYMS FOR necessary
1 required, needed. Necessary, essential, indispensable, requisite indicate something vital for the fulfillment of a need. Necessary applies to something 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. Something that 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.
ANTONYMS FOR necessary
Related formsnec·es·sar·i·ness, nounqua·si-nec·es·sar·y, adjective
Can be confusednecessary necessitous (see synonym study at the current entry)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for necessariness
/ (ˈnɛsɪsərɪ) /
needed to achieve a certain desired effect or result; required
resulting from necessity; inevitablethe necessary consequences of your action
- (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 affairsCompare sufficient (def. 2)
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
rare compelled, as by necessity or law; not free
the necessary informal the money required for a particular purpose
do the necessary informal to do something that is necessary in a particular situation
See also necessaries
Word Origin for necessary
C14: from Latin necessārius indispensable, from necesse unavoidable
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012