biannualWiktionary 原文英/bʌɪˈanjuːəl/美/baɪˈænjuəl/adj.一年两次的中文释义来自 ECDICT构词拆解bibi-前缀annualannual词干bi-Two in number. · Having or possessing two of the root word's quality.词源说明From bi- + annual.释义形容词adjective1Occurring twice a year; semiannual.2proscribedOccurring once every two years; biennial.名词noun1Something occurring twice each year.