trimester

tri·mes·ter  (tr-mstr, trms-)

n.

1. A period or term of three months.

2. One of three terms into which an academic year is divided in some universities and colleges.

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[French trimestre, from Latin trimstris, trimnstris, of three months : tri-, tri- + mnsis, month; see m-² in Indo-European roots.]

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tri·mestral (-trl), tri·mestri·al (-tr-l) adj.

Thesaurus

Noun	1.	trimester - a period of three months; especially one of the three three-month periods into which human pregnancy is divided period, period of time, time period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period" gestation, gestation period - the period during which an embryo develops (about 266 days in humans) first trimester - time period extending from the first day of the last menstrual period through 12 weeks of gestation second trimester - time period extending from the 13th to the 27th week of gestation third trimester - time period extending from the 28th week of gestation until delivery
	2.	trimester - one of three divisions of an academic year academic year, school year - the period of time each year when the school is open and people are studying academic session, academic term, school term, session - the time during which a school holds classes; "they had to shorten the school term"