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