triennial
adjective
uk/traɪˈen.i.əl/us/traɪˈen.i.əl/happeningevery threeyears:
每三年的;三年一次的the association's triennialconference该协会三年一届的大会
Relating to regular periods of time
- afternoons
- annual
- annum
- bi
- biannual
- biannually
- biweekly
- daily
- evenings
- fortnightly
- half-hourly
- nightly
- nights
- p.c.m.
- p.w.
- pa
- per annum
- per calendar month
- quadrennial
- season