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Necessary or necessity may refer to:
- An action somebody may feel they must do
- An important task or essential thing to do at a particular time or by a particular moment
- Necessary and sufficient condition, in logic, something that is a required condition for something else to be the case
- Necessary proposition, in logic, a statement about facts that is either unassailably true (tautology) or obviously false (contradiction).
- Metaphysical necessity, in philosophy, a truth which is true in all possible worlds
- Necessity in modal logic
- Doctrine of necessity, a concept in constitutional law
- Military necessity, a concept in international law
- Necessity (criminal law), a defence in criminal law
- Necessity (tort), a concept in the law of tort
- A necessity in contract law
- A bathroom or toilet, in some languages (in English this is an archaic usage)
- An economic need enunciated by US President Franklin D. Roosevelt in his 1944 Second Bill of Rights
- Necessity (novel), of 2016 by Jo Walton
- Necessary Records, UK record label
- All pages beginning with "Necessary"
- All pages with a title containing Necessary
- All pages beginning with "necessity"
- All pages with a title containing necessity
- Bare Necessities (disambiguation)
|This disambiguation page lists articles associated with the title Necessary.
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