biyearly adjective 2adverb 2 adjective2 •Occurring twice per year; biannual.At the end of the month when Ayah conducts her biyearly search for nits on our heads, she discovers we have each sprung one white hair! — 1988 •Occurring every two years; biennial. adverb2 •Twice per year; biannually •Every two years; biennially
