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The definition of necessary
7 Definitions of: necessary
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- adjective, needed to achieve a certain desired effect or result; required
- adjective, resulting from necessity; inevitable
- adjective, 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) (of a condition) entailed by the truth of some statement or the obtaining of some state of affairs ▷ See also sufficient
- adjective, 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
- adjective, compelled, as by necessity or law; not free
- noun, the money required for a particular purpose
- noun, do the necessary to do something that is necessary in a particular situation ▷ See also necessaries
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| Synonyms: | need, require, essential, vital, compulsory, mandatory, imperative, indispensable, obligatory, requisite | And more... |
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| Antonyms: | unnecessary |
From Collins
©HarperCollins 2008. Collins English Dictionary definition of necessary