triennialadjective
uk/traɪˈen.i.əl/us/traɪˈen.i.əl/happening every three years:
the association's triennial conference
Thesaurus: synonyms and related words
Relating to regular periods of time
- -ly
- afternoons
- annual
- annum
- bi
- biannual
- biennial
- daily
- evenings
- fortnight
- half-hourly
- hourly
- nightly
- nights
- pa
- pcm
- per annum
- per calendar month
- pw
- season
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