D defs.my
Entry 1 sense Webster, 1913

Invalidation

/ĭnˌ-vălˌ-əd-āsh'-ən/ · In·val·i·da·tion · IPA /ɪnˌvæl.əˈdeɪ.ʃən/
01 n. The act of inavlidating, or the state of being invalidated.
  1. 1.
    The act of inavlidating, or the state of being invalidated.
    “So many invalidations of their right.” Burke.