Necessary may refer to:
- Something that is a required condition for something else to be the case, see necessary and sufficient conditions.
- A necessary truth, something that cannot fail to be true, see logical possibility. The meaning of the word truth extends from Honesty, Good faith, and Sincerity in general to agreement with Fact or Reality A logically possible Proposition is one that can be asserted without implying a logical Contradiction.
- An important task or essential thing to do at a particular time or by a particular moment.
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