Definitions
1.AdjectiveSuch that, when performed multiple times on the same subject, it has no further effect on its subject after the first time it is performed."A projection operator is idempotent.; An HTTP request using the PUT verb should be idempotent, so that it can be sent to the server any number of times with the same end result."
2.AdjectiveSuch that, when it operates on itself, the result is equal to itself."Every finite semigroup has an idempotent element.; Every group has a unique idempotent element: namely, its identity element."
3.AdjectiveSuch that all of the distinct elements it can operate on are idempotent ."Since the AND logical operator is commutative, associative, and idempotent, it distributes with respect to itself."
4.AdjectiveHaving an idempotent operation .
5.NounAn idempotent element.
6.NounAn idempotent structure.