2 syllables: les, sen. Stress on les.
/ˈlɛsən/
Say it backLessen is a verb meaning to reduce or make smaller in degree, amount, or intensity. It implies a decrease that is often gradual or gradualized, rather than abrupt. The word is commonly used in formal and semi-formal contexts, as in policies may lessen restrictions or burdens may lessen over time.
"The new policy will lessen the burden on small businesses."
"A colder front will lessen the risk of heat-related illnesses."
"Efforts to lessen noise in the city have yielded measurable improvements."
Pronounce as LESS-ən, with a stressed first syllable. IPA: US /ˈlɛsən/, UK /ˈlesn̩/ (often with a syllabic n). Start with a short, lax front vowel /ɛ/ as in ‘let’, then an unstressed schwa or a reduced /ə/ in the second syllable, ending with a light /n/. Ensure the final consonant is not overly aspirated. You’ll hear a clear but brief second syllable, often reduced in rapid speech.
Two common mistakes: 1) Over-lengthening the second syllable, making it sound like LEH-sen rather than LESS-ən. 2) Misplacing the vowel in the first syllable, using /eɪ/ or /i/ instead of the lax /ɛ/; keep it close to ‘let’. Correction: keep first syllable short and crisp /ˈlɛs/ and reduce the second syllable to a quick /ən/ or /n̩/ if syllabic, with a light nasal release.
In US English, the first syllable is a clear /ˈlɛs/ with a pronounced /ɛ/ and a pronounced final /ən/ or a reduced /ən/. In UK English, the first syllable is /ˈles/ with a shorter /e/ and often a non-syllabic ending; some speakers store the second vowel as a reduced syllable. In Australian English, you’ll encounter a similar US/UK pattern but with a more centralized /ə/ and slightly more open /ɛ/. Overall, rhoticity is not a major factor here, but vowel quality and stress can shift subtly by region.
Because the word sits at the boundary of a short, lax vowel followed by a light, often syllabic consonant. The challenge is producing a crisp /ˈlɛs/ on the first syllable while transitioning smoothly into a reduced /ən/ or /n̩/ without adding extra vowel sounds. Additionally, some speakers aspirate the final /n/ or mispronounce it as /lɛsən/ with two vowels; aim for a single quick, unaccented nasal release. IPA cues help you lock the timing.
Yes—its first syllable contains a short, lax front vowel with a crisp /s/ before it, and the second syllable often reduces to a schwa or syllabic /n/. The unique nuance is keeping the /s/ crisp and not letting the second syllable drift into a separate fully pronounced vowel. In careful articulation, you might hear /ˈlɛs.n̩/ in careful speech or /ˈlesən/ in more careful enunciation.
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Lessen comes from Old English lessen, from less meaning “less, not as much,” which is linked to the Proto-Germanic *laisaz, related to the Old High German lēs, and the Proto-Indo-European root *les-. The sense developed through the idea of making something less in quantity or degree. By the medieval period, lessen appeared as a verb meaning to diminish or reduce, with usage expanding in legal, religious, and everyday contexts. The form has remained stable across centuries, maintaining its core meaning of decreasing magnitude or impact. The word’s etymology tracks a straightforward path from a simple quantifier concept (less) to a verb of action (to make less). The traditional sense remains unchanged today, though modern usage often appears in metaphorical contexts as well as concrete reductions. First known use is documented in Old English texts, where “lessen” described diminishing a quantity or effect, later evolving into the Middle English form that settled into the modern “lessen.”
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💡 These words have similar meanings to "lessen" and can often be used interchangeably.
🔄 These words have opposite meanings to "lessen" and show contrast in usage.
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Words that rhyme with "lessen"
-sen sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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