Part of speech:
Done, happening, appearing, etc. every half year or twice a year
Of, characteristic of, or depending on the season or seasons
Find another word for semiannual. In this page you can discover 10 synonyms, antonyms, idiomatic expressions, and related words for semiannual, like: , half-yearly, biannual, every six months, semiyearly, seasonal, biyearly, semi-annual, f2-layer and NmF2.