triannual

triannual [trahy-an-yoo-uh l] Word Origin adjective

1. done, occurring, issued, etc., three times a year.
2. triennial.

noun

3. a triannual publication, contest, etc.
4. triennial.

Origin of triannual First recorded in 1630–40; tri- + annual Related formstri·an·nu·al·ly, adverb Word Origin and History for triannual adj.

1630s, from tri- + annual. Related: Triannually.