Source : Webster's Revised Unabridged Dictionary (1913)

Abrogation \Ab`ro*ga"tion\, n. [L. abrogatio, fr. abrogare: cf.
   F. abrogation.]
   The act of abrogating; repeal by authority.    --Hume.

Source : WordNet®

abrogation
     n : the act of abrogating; an official or legal cancellation
         [syn: {repeal}, {annulment}]