Webster's English Dictionary

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omission

omis.sion \o--'mish-*n, *-\ n [ME omissioun, fr. LL omission-, omissio, fr. 
   L omissus], pp. of omittere 1a: apathy toward or neglect of duty  1b: 
   something neglected or left undone  2: the act of omitting : the state of 
   being omitted