a. and sb. [f. BI- pref.2 4, 4 b + ANNUAL.] A. adj. Used as = Half-yearly. B. sb. = BIENNIAL sb. Hence Biannually adv.
1877. ‘Ouida,’ Puck, xii. 123. Every half-year his lawyers transmitted him … the biannual rental.
1884. Illustr. Sydney News, 26 Aug., 15/1. Plant out … annuals and bi-annuals.
1882. Century Mag., XXIII. 647. A change in the fashion of her clothes bi-annually at least.
