obligatory
英 [ə'blɪgət(ə)rɪ]
美[ə'blɪɡətɔri]
- adj. 义务的；必须的；义不容辞的
英英释意
- 1. morally or legally constraining or binding;
- "attendance is obligatory"
- "an obligatory contribution"
- 2. required by obligation or compulsion or convention;
- "he made all the obligatory apologies"