trimonthlyadj.
1. Occurring every three months.
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
the world > time > period > a month or calendar month > [adjective] > lasting or occurring every specific number of months
trimestre1623
half-yearly1660
trimestrial1693
two-monthly1811
trimestral1824
decimestrial1842
bimestrial1846
trimonthly1856
bi-monthly1879
trimensual1891
semestrial1894
1856 Trans. Michigan Agric. Soc. 7 329 The Steamer Superior..made tri-monthly trips from Buffalo to Detroit.
1869 J. D. Burns Mem. & Rem. vi. 104 Our trimonthly Communion.
2. Lasting or extending over three months.
ΚΠ
1870 Cornhill Mag. July 66 The trimonthly homes of country squires.
1879 Daily News 1 Dec. 6/5 Annual as opposed to bi-monthly or tri-monthly budgets.
This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2019).
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adj.1856