biannualadj.n.
/bʌɪˈanjuːəl/ A. adj.
Used as = Half-yearly.
ΘΚΠ
the world > time > period > year > [adjective] > occurring specific number of times a year
quarterly1563
trimestrial1693
semestrial1701
semi-annual1794
three-monthly1819
trimestral1824
bi-monthly1846
trimonthly1856
biannual1870
triannual1901
1870 ‘Ouida’ Puck I. xii. 245 Every half-year his lawyers transmitted him..the biannual rental.
B. n.
= biennial n.
ΘΚΠ
the world > plants > by age or cycles > [noun] > biennial
bisannual1725
biennial1772
biannual1884
1884 Illustr. Sydney News 26 Aug. 15/1 Plant out..annuals and bi-annuals.
Derivatives
biˈannually adv.
ΘΚΠ
the world > time > period > a month or calendar month > [adverb] > during or occurring every specific number of months
month about1749
bi-monthly1846
biannually1882
semestrially1891
1882 Cent. Mag. 23 647 A change in the fashion of her clothes bi-annually at least.
This entry has not yet been fully updated (first published 1887; most recently modified version published online December 2018).
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adj.n.1870