noun
a right or privilege exclusive to a particular individual or class
adjective
relating to a prerogative
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It is within the president's prerogative to veto a bill passed by Congress.
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It's totally your prerogative if you want to go out tonight or stay in.
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I don't know why she feels the need to make decisions for us, it's not her prerogative.
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Having the last slice of pizza is considered a sacred prerogative in our household.