trim estral

trimester

[trahy-mes-ter, trahy-mes-]
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:
1815–25; < French trimestre < Latin trimē(n)stris of three months, equivalent to tri- tri- + -mē(n)stris (see semester)

trimestral [trahy-mes-truhl] , trimestrial, adjective
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World English Dictionary
trimester (traɪˈmɛstə)
 
n
1.  a period of three months
2.  (in some US and Canadian universities or schools) any of the three academic sessions
 
[C19: from French trimestre, from Latin trimēstris of three months, from tri- + mēnsis month]
 
tri'mestral
 
adj
 
tri'mestrial
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

trimester
1821, "period of three months," from Fr. trimestre (1611), from L. trimestris "of three months," from tri- "three" + mensis "month" (see moon (n.)). Specific obstetrics sense is attested from 1916.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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