Necessary or necessity may refer to:
Concept of necessity Need 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 Logical necessity, a statement about facts that is unassailably true Metaphysical necessity, in philosophy, a truth which is true in all possible worlds Necessity in modal logic Necessity good in economics
Law 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
Other uses , a poem by Letitia Elizabeth Landon being part of Three Extracts from the Diary of a Week, 1837. "Necessary" (song), by Every Little Thing, 1998 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
See also
Bare Necessities (disambiguation)