idempotence

Latin roots, idem (“same”) +‎ potence (“the quality of having power”) – literally, “the quality of having the same power”. Coined by 19th century American mathematician Benjamin Peirce in context of algebra.^[1]

idempotence (uncountable)

1. (mathematics, computing) A quality of an action such that repetitions of the action have no further effect on the outcome; the state of being idempotent.
   • 2022 August 4, William Bahn, “Boolean Algebra Laws—Delving Into Boolean Identities”, in All About Circuits‎^[1]:

     The proof (Tables 9 and 10) of idempotence for both OR and AND follows from examining the definition of each operation under the constraint that both inputs have the same value.