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semiannual

[sem-ee-an-yoo-uh l, sem-ahy-]
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adjective
  1. occurring, done, or published every half year or twice a year; semiyearly.
  2. lasting for half a year: a semiannual plant.

Origin of semiannual

First recorded in 1785–95; semi- + annual
Related formssem·i·an·nu·al·ly, adverb
Can be confusedbiannual biennial semiannual (see usage note at bi-1)

Usage note

See bi-1.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for semi-annual

semiannual

adjective
  1. occurring every half-year
  2. lasting for half a year
Derived Formssemiannually, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for semi-annual

adj.

also semiannual, 1775, from semi- + annual. Related: Semiannually.

Online Etymology Dictionary, © 2010 Douglas Harper