| Adj. | 1. | biyearly - occurring every second year; "they met at biennial conventions" Synonyms: biennial |
| 2. | biyearly - occurring or payable twice each year Synonyms: biannual, semiannual | |
| Adv. | 1. | biyearly - every two years; "this festival takes places biennially" Synonyms: biennially |
| 2. | biyearly - twice a year Synonyms: semiannually |
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