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.

trimester

/ traɪˈmɛstə /

noun

1. a period of three months

2. (in some US and Canadian universities or schools) any of the three academic sessions

Other Word Forms

• trimestral adjective
• trimestrial adjective

Word History and Origins

Origin of trimester¹

1815–25; < French trimestre < Latin trimē ( n ) stris of three months, equivalent to tri- tri- + -mē ( n ) stris ( semester )

Word History and Origins

Origin of trimester¹

C19: from French trimestre , from Latin trimēstris of three months, from _tri- + mēnsis month

Example Sentences

Maternal vaccination during the third trimester of pregnancy and passive immunization of newborns using long-acting antibodies are being rolled out in many countries.

Read more on Science Daily

The authors also documented a dose-response pattern, meaning the risk rose as the number of affected trimesters increased.

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Rebecca had had a difficult first trimester dealing with nausea and sickness, and began to develop pelvic pain four months into her pregnancy.

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A year later, the Centers for Disease Control and Prevention recommended that the vaccine be given to all newborns whose mothers tested positive for hepatitis B in their first trimester.

Read more on The Wall Street Journal

Now 38 and pregnant in her third trimester with her third child, Ms Ventura met Mr Combs when she was a 19-year-old aspiring singer and he was 37.

Read more on BBC