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Necessary may refer to:
- Something that is a required condition for something else to be the case, see necessary and sufficient condition.
- A necessary truth, something that cannot fail to be true, see logical possibility.
- An important task or essential thing to do at a particular time or by a particular moment.
- Necessity in the context of criminal law
- An action somebody may feel they must do
- In some languages a "necessary" is a bathroom or toilet. In English this is an archaic usage.
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