biyearly

[bahy-yeer-lee] /baɪˈyɪər li/
adjective
1.
biennial (defs 1, 2).
adverb
2.
biennially; biannually.
3.
twice yearly.
Origin
1875-80; bi-1 + yearly
Usage note
See bi-1.
British Dictionary definitions for biyearly

biyearly

/baɪˈjɪəlɪ/
adjective, adverb
1.
every two years; biennial or biennially
2.
(often avoided because of confusion with sense 1) twice a year; biannual or biannually See bi-1