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[sem-ee-an-yoo-uh l, sem-ahy-] /ˌsɛm iˈæn yu əl, ˌsɛm aɪ-/
occurring, done, or published every half year or twice a year; semiyearly.
lasting for half a year:
a semiannual plant.
Origin of semiannual
1785-95; semi- + annual
Related forms
semiannually, adverb
Can be confused
biannual, biennial, semiannual (see usage note at bi-)
Usage note
See bi-1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for semiannually
  • Payments may be made annually, semiannually, or quarterly.
  • Data are obtained semiannually through telephone surveys.
  • The committee shall semiannually authorize distribution of money from the fund to eligible public safety agencies or counties.
  • Until that date, the corporation usually pays you a stated rate of interest, generally semiannually.
  • Interest earned from the composite rate accrues monthly and is compounded semiannually.
  • Interest and administration fee are billed semiannually, and principal is billed semiannually after project completion.
  • If the operator and purchaser mutually agree, low volume gas well meters may be calibrated semiannually rather than quarterly.
  • They are issued with a stated rate of interest, pay interest semiannually, and are redeemed at par at maturity.
British Dictionary definitions for semiannually


occurring every half-year
lasting for half a year
Derived Forms
semiannually, 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
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