D defs.my
Entry 1 sense Webster, 1913

Supersession

· Su·per·ses·sion · IPA /supɚˈsɛʃ(ə)n/
01 n. The act of superseding, or the state of being superseded; supersedure.
  1. 1.
    The act of superseding, or the state of being superseded; supersedure.
    “The general law of diminishing return from land would have undergone, to that extent, a temporary supersession.” — J. S. Mill.