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
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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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Example sentences
Cutting-edge technology makes it possible for us to explore each trimester in
  amazing new detail.
The center's trimester schedule means students move through the program quickly.
During the third trimester or summer students may opt for an exchange placement.
Actually, her mom was pregnant in the second trimester when the disaster
  happened.
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