Entry 1 sense Webster, 1913 Semiquaver /(sĕm"ĭ*kwā`vẽr)/ · Sem·i·qua·ver · IPA /ˈsɛmiˌkweɪvə(ɹ)/ 01 n. A note of half the duration of the quaver; -- now usually called a sixteenth note. 1. A note of half the duration of the quaver; -- now usually called a sixteenth note.(Mus.) Also: sixteenth note