semi-annualadj.n.

Etymology: semi- prefix 2a(b). Compare Latin sēmi-annuus in sense 2, and French semi-annuel.Previous versions of the OED give the stress as: semi-ˈannual.

1. Recurring every half-year; 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

1794 R. J. Sulivan View of Nature I. 414 The tides are semi-diurnal polar effusions, as the general currents of the ocean are semi-annual.

1803 Philos. Trans. (Royal Soc.) 93 470 Semi-annual solar Equation, Precession, and Refraction.

1860 (title) Semi-Annual United States Register.

1866 A. Crump Pract. Treat. Banking i. 33 Merchants are not in the habit of placing a semi-annual or even annual statement of their position before the public.

1869 Ann. Rep. Commissioner Agric. 1868 260 in U.S. Congress. Serial Set (40th Congr., 3rd Sess.: House of Representatives Executive Doc.) XV [Esparto] becoming more vigorous and abundant with yearly or semi-annual gathering.

2. Lasting for half a year (only); esp. of plants. Also n. = semi-annual plant.

ΘΚΠ

the world > plants > by age or cycles > [noun] > annual

annual1633

hardy annual1706

tender annual1769

winter annual1857

semi-annual1882

therophyte1913

the world > time > period > year > [adjective] > that lasts a year > lasting for part of a year

semi-annual1882

1882 Encycl. Brit. XIV. 857/1 The higher plants may be classed, according to duration of life, as follows:—annuals, or semi-annuals..biennials.

1888 J. W. Dawson Geol. Hist. Plants 258 Arctic semi-annual days and nights.

Derivatives

semi-ˈannually adv. every half-year, once in every six months.

ΘΚΠ

the world > time > period > year > [adverb] > every half or quarter of a year

quarterly1418

half-yearlya1687

semi-annually1828

1828–32 in N. Webster Amer. Dict. Eng. Lang.

1889 J. S. Farmer Americanisms at Papabotte It visits the Western prairies in large numbers semi-annually; early in the spring and late in the summer.

This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022).

单词	semi-annual
释义	semi-annualadj.n. Etymology: semi- prefix 2a(b). Compare Latin sēmi-annuus in sense 2, and French semi-annuel.Previous versions of the OED give the stress as: semi-ˈannual. 1. Recurring every half-year; 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 1794 R. J. Sulivan View of Nature I. 414 The tides are semi-diurnal polar effusions, as the general currents of the ocean are semi-annual. 1803 Philos. Trans. (Royal Soc.) 93 470 Semi-annual solar Equation, Precession, and Refraction. 1860 (title) Semi-Annual United States Register. 1866 A. Crump Pract. Treat. Banking i. 33 Merchants are not in the habit of placing a semi-annual or even annual statement of their position before the public. 1869 Ann. Rep. Commissioner Agric. 1868 260 in U.S. Congress. Serial Set (40th Congr., 3rd Sess.: House of Representatives Executive Doc.) XV [Esparto] becoming more vigorous and abundant with yearly or semi-annual gathering. 2. Lasting for half a year (only); esp. of plants. Also n. = semi-annual plant. ΘΚΠ the world > plants > by age or cycles > [noun] > annual annual1633 hardy annual1706 tender annual1769 winter annual1857 semi-annual1882 therophyte1913 the world > time > period > year > [adjective] > that lasts a year > lasting for part of a year semi-annual1882 1882 Encycl. Brit. XIV. 857/1 The higher plants may be classed, according to duration of life, as follows:—annuals, or semi-annuals..biennials. 1888 J. W. Dawson Geol. Hist. Plants 258 Arctic semi-annual days and nights. Derivatives semi-ˈannually adv. every half-year, once in every six months. ΘΚΠ the world > time > period > year > [adverb] > every half or quarter of a year quarterly1418 half-yearlya1687 semi-annually1828 1828–32 in N. Webster Amer. Dict. Eng. Lang. 1889 J. S. Farmer Americanisms at Papabotte It visits the Western prairies in large numbers semi-annually; early in the spring and late in the summer. This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022). < adj.n.1794
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