IPA: /ˌsɛm.iˈæn.ju.ə.li/
KK: /ˌsɛmɪˈænjuəli/
Occurring two times a year.
The company holds semiannual meetings to discuss progress and future plans.
Semiannually → It is formed from "semi-" (meaning half) and "annus" (meaning year). The word describes something that occurs half as often as annually, or twice a year.
Think of 'half' ('semi-') of a 'year' ('annus') to remember that 'semiannually' means something happens twice a year.