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 necessaries.
something necessary or requisite; 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.

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

necessariness, noun
quasi-necessary, adjective

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

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.

1. dispensable. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
necessaries (ˈnɛsɪsərɪz)
pl n
1.  (sometimes singular) what is needed; essential items: the necessaries of life
2.  law food, clothing, etc, essential for the maintenance of a dependant in the condition of life to which he or she is accustomed

necessary (ˈnɛsɪsərɪ)
1.  needed to achieve a certain desired effect or result; required
2.  resulting from necessity; inevitable: the necessary consequences of your action
3.  logic
 a.  (of a statement, formula, etc) true under all interpretations or in all possible circumstances
 b.  (of a proposition) determined to be true by its meaning, so that its denial would be self-contradictory
 c.  (of a property) essential, so that without it its subject would not be the entity it is
 d.  (of an inference) always yielding a true conclusion when its premises are true; valid
 e.  Compare sufficient (of a condition) entailed by the truth of some statement or the obtaining of some state of affairs
4.  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
5.  rare compelled, as by necessity or law; not free
6.  informal the necessary the money required for a particular purpose
7.  informal do the necessary to do something that is necessary in a particular situation
[C14: from Latin necessārius indispensable, from necesse unavoidable]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

mid-14c. (n.), late 14c. (adj.), from L. necessarius, from necesse "unavoidable, indispensable," originally "no backing away," from ne- "not" + cedere "to withdraw, go away, yield" (see cede). Necessary house "privy" is from c.1600. Related: Necessarily.
Online Etymology Dictionary, © 2010 Douglas Harper
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