semimonthly Syllabification: (sem·i·month·ly)Pronunciation: /ˌsemēˈmənTHlē, ˌsemˌī-/Definition of semimonthly adjective chiefly North American occurring or published twice a month:semimonthly paydayssemimonthly in other Oxford dictionaries Definition of semimonthly in the British & World English dictionary