3 syllables: Tri, me, ster. Stress on me.
treye-MES-tur
/tɹaɪˈmɛstɚ/
Trimester is pronounced treye-MES-tur (/tɹaɪˈmɛstɚ/). It has three syllables (Tri-me-ster), with the stress on "me". Trimester is a noun referring to one of the three roughly equal periods into which a human pregnancy, or a school term, is divided. Each trimester marks a phase of development or progression within the total duration, typically around three months in duration. The term is commonly used in medical, educational, and research contexts, with trimester boundaries often guiding routine checkups or curricular planning.
nounTrimester is a noun referring to one of the three roughly equal periods into which a human pregnancy, or a school term, is divided. Each trimester marks a phase of development or progression within the total duration, typically around three months in duration. The term is commonly used in medical, educational, and research contexts, with trimester boundaries often guiding routine checkups or curricular planning.
"The doctor scheduled her next ultrasound for the second trimester."
"In university, she completed the first trimester before switching majors."
"The study tracked growth across each trimester of pregnancy."
Pronounce as /ˈtrɪ.mes.tɚ/ (US) or /ˈtraɪ.mes.tə/ (UK). Stress falls on the first syllable. Start with a short, clipped 'tri-' or 'trai-' depending on accent, then a clear 'mes' with e as a short e, and finish with a relaxed 'ter' or 'tə'. Audio references: consult standard dictionaries and pronunciation tools for voice samples; practicing aloud in sequences helps solidify the three-syllable rhythm.
Common errors: misplacing stress (trying tri- as a two-syllable word), mispronouncing the middle syllable as a long 'may' instead of a short 'mes', and slurring the final 'ster' into a single sound. Correct by stressing the first syllable, using a short /ɛ/ in 'mes', and finishing with a clear /tɚ/ (US) or /tə/ (UK). Practice with slow repetitions and minimal pairs focused on the middle vowel.
US tends to /ˈtrɪ.mes.tɚ/ with a rhotic final syllable; UK uses /ˈtraɪ.mes.tə/ with a shorter, non-rhotic final; AU often aligns closer to US but may have a rounded or slightly elongated middle vowel depending on speaker. The middle vowel is typically a short /e/ or a near-close /eɪ/ variant depending on region. Maintain a crisp initial consonant cluster and a shorter final syllable in US and AU.
Difficulty comes from the three-syllable rhythm and the mid-word vowel in 'mes' that often forces a quick, reduced vowel in natural speech. The final syllable can trick learners into delaying the /t/ or merging 'ster' with 'mes'. Focus on segmenting into three distinct syllables with a steady, even tempo and practice the middle vowel /e/ distinctly.
A notable feature is the non-final stress shift in some dialects during rapid speech, where speakers may subtly reduce the final syllable and shift timing, though formal pronunciation remains on the first syllable. Remember to keep the primary stress on the first syllable regardless of speed, and maintain three clear syllables when articulating in clinical or academic contexts.
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Trimester derives from Latin trimester, formed from tri- ‘three’ (from Latin tres, three) and -mester, a variant of -mester from French estimate ‘period’ or ‘term’ (from Latin mensis, month — via Old French mestr). The word entered English in the late 16th to early 17th century, initially in medical contexts to denote one of three divisions of gestation or of a term. Its use expanded into education and other fields where a three-part division is useful. Over time, trimester became the standard term in obstetrics to describe the three successive phases of pregnancy: first, second, and third trimester, each associated with specific developmental milestones and prenatal care schedules. The semantic shift from “three months” to “three-term division” reflects the broader adoption of fixed-term segmentation in modern professional discourse.
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💡 These words have similar meanings to "Trimester" and can often be used interchangeably.
🔄 These words have opposite meanings to "Trimester" and show contrast in usage.
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Words that rhyme with "Trimester"
-ter sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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