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trimester

noun

tri·​mes·​ter (ˌ)trī-ˈme-stər How to pronounce trimester (audio)
ˈtrī-ˌ
1
: a period of three or about three months
especially : any of three periods of approximately three months each into which a human pregnancy is divided
2
: one of three terms into which the academic year is sometimes divided

Did you know?

Semester, which comes from the Latin words for "six" and "month", has come to mean half an academic year when the year is divided into two segments. When an academic year is divided into three segments, each is called a trimester (which is usually a bit more accurate, since each segment often is close to three months in length). Some colleges operate on the "quarter" system, with the summer being the fourth quarter, but this just means that each quarter is basically a trimester. In a human pregnancy, a trimester is three months long, representing one-third of the nine months that a typical pregnancy lasts.

Example Sentences

development in the first trimester
Recent Examples on the Web Pupetta caught my eye because of the audacity of her crimes — avenging the hit on her mobster husband at the age of 18 in the third trimester of pregnancy. Barbie Nadeau, Rolling Stone, 6 Sep. 2022 Meanwhile, Virginia still allows most abortions through the second trimester. Sam Whitehead, NBC News, 11 Aug. 2022 The vast majority of abortions — nearly 90% — that occurred in Michigan last year were performed in the first trimester of the pregnancy, according to data from the state health department. Detroit Free Press, 25 Aug. 2022 Of the approximately 1 million legal abortions provided each year in the U.S., 90% occur in the first trimester, or through the 12th week of pregnancy. Adelaide H. Mcclintock, The Conversation, 11 Aug. 2022 In practice, nearly 93% of abortions are in the first trimester, and less than 1% occur in the third, according to the CDC. Francine Kiefer, The Christian Science Monitor, 2 Aug. 2022 Cancer drugs are dangerous for fetuses in the first trimester. Gina Kolata, BostonGlobe.com, 23 July 2022 Cancer drugs are dangerous for fetuses in the first trimester. New York Times, 23 July 2022 There was a time when women so often miscarried in the first trimester that some jurists didn’t regard the fetus as a full human being, while others debated when the soul enters the fetus – somewhere between 40 and 120 days, the professor said. Eliott C. Mclaughlin, CNN, 17 July 2022 See More

Word History

Etymology

French trimestre, from Latin trimestris of three months, from tri- + mensis month — more at moon

First Known Use

1821, in the meaning defined at sense 1

Time Traveler
The first known use of trimester was in 1821

Phrases Containing trimester

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