semiannual Syllabification: (sem·i·an·nu·al)Pronunciation: /ˌsemēˈanyo͞oəl, ˌsemˌī-/Definition of semiannual adjective occurring twice a year; half-yearly:their semiannual meetings (of a plant) living for half a year only. noun a semiannual plant. Derivatives semiannually adverb semiannual in other Oxford dictionaries Definition of semiannual in the British & World English dictionary
