Webster's English Dictionary

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inadvertence

in.ad.ver.tence \.in-*d-'v*rt-*n(t)s\ n [ML inadvertentia, fr. L in- + 
   advertent-, advertens, p]rp. of advertere to advert 1: the fact or action 
   of being inadvertent : INATTENTION  2: a result of inattention : OVERSIGHT