Black's Law Dictionary (2nd edition)dictionaries

Biennially

This term, in a statute, signifies, not duration of time, but a period for the happening of an event; once in every two years. People v. Tremain, 9 Hun (N. Y.) 576; People v. Kilbourn, 68 N. Y. 479

Source: Black's Law Dictionary 2nd Ed (1910)