Biannual means happening twice a year. It describes events that occur every six months or so.
From Latin “bi-” meaning “two” and “annus” meaning “year.” English added the “-ual” ending to form an adjective.
Biannual is easy to confuse with “biennial,” which means once every two years. A memory trick: biannual = “two in a year,” biennial = “two-year gap.”
Complete word intelligence in one call. Free tier — 50 lookups/day.