Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “trimester”


noun [C]     /trɪˈmes.tər/ /traɪ-/ US  /traɪˈmes.tɚ/
a three-month period Specific periods of time any of the three three-month periods that a human pregnancy is divided into: The second trimester is generally the easiest part of a pregnancy .PregnancyBirthSpecific periods of time US any of the three-month periods into which the school or college year is sometimes divided : Many students arrange internships or work-study placements during the second trimester. → Compare semesterUniversity and college educationSchools in general
(Definition of trimester noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of trimester

Definitions of “trimester” in other dictionaries

Word of the Day

best man

a male friend or relation of the bridegroom who stands with him and helps him during a marriage ceremony

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More