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trimester definition

tri·mes·ter (trī mes′tər, trī′mes′-)

noun

  1. a period or term of three months; specif., any of the three three-month periods of a human pregnancy
  2. in some colleges and universities, any of the three periods into which the academic year is divided

Etymology: Fr trimestre < L trimestris, of three months < tri-, three + mensis, month: see moon

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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