trimester.
A period of three months or about three months; (financial): quarter.
Meaning & usage
A period of three months or about three months; (financial): quarter.
She is in the second trimester of her first pregnancy.
One of the terms of an academic year in those learning institutions that divide their teaching in three roughly equal terms, each about three months long. Compare semester.
The school operates on a trimester schedule.
Where this word comes from
PIE word *tréyes From French trimestre, from Latin trimestris (“of three months”), from trēs (“three”) + mensis (“month”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.