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trimester

[trahy-mes-ter, trahy-mes-] /traɪˈmɛs tər, ˈtraɪ mɛs-/
noun
1.
a term or period of three months.
2.
one of the three approximately equal terms into which the year is divided by some colleges, schools, etc.
Origin
1815-1825
1815-25; < French trimestre < Latin trimē(n)stris of three months, equivalent to tri- tri- + -mē(n)stris (see semester)
Related forms
trimestral
[trahy-mes-truh l] /traɪˈmɛs trəl/ (Show IPA),
trimestrial, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for trim-estral

trimester

/traɪˈmɛstə/
noun
1.
a period of three months
2.
(in some US and Canadian universities or schools) any of the three academic sessions
Derived Forms
trimestral, trimestrial, adjective
Word Origin
C19: from French trimestre, from Latin trimēstris of three months, from tri- + mēnsis month
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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Word Origin and History for trim-estral

trimester

n.

1821, "period of three months," from French trimestre (early 17c.), from Latin trimestris "of three months," from tri- "three" (see tri-) + mensis "month" (see moon (n.)). Specific obstetrics sense is attested from 1916.

Online Etymology Dictionary, © 2010 Douglas Harper
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trim-estral in Medicine

trimester tri·mes·ter (trī-měs'tər, trī'měs'-)
n.
A period of three months.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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