Webster's English Dictionary

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anniversary

an.ni.ver.sa.ry \.an-*-'v*rs-(*-)re-\ n [ME anniversarie, fr. ML, 
   anniversarium, fr. L, neut. of anniver] often attrib sarius returning 
   annually, fr. annus year + versus, pp. of vertere to turn - more at ANNUAL, 
   WORTH 1: the annual recurrence of a date marking a notable event  2: the 
   celebration of an anniversary