3 syllables: in, fu, sion. Stress on fu.
/ˌɪnˈfjuʒən/
Say it backInfusion refers to the process of slowly introducing a liquid, chemical, or flavor into another substance, or the resulting mixture formed. It can describe a medicinal or culinary technique, the steady addition of a component, or a state of being filled with a quality. In medicine, it often denotes administration via infusion rather than ingestion, while in cooking it describes flavor extraction. The term conveys gradual integration rather than abrupt mixing.
- Misplacing stress: You should stress the second syllable (in-FU-sion). If you stress the first, it sounds off in English. Practice by saying the word slowly, then say it with forced stress on the second syllable until it feels natural. - Mispronouncing /fjuː/ as /fu/ or /fj/ without the glide: The correct is /fjuː/ with a smooth y-glide from /f/ to /j/. Practice breaking into /f/ + /juː/ and then merge. - Ending cluster confusion: The final /ʒən/ can blur to /zən/ or /ʃən/ in rapid speech. Keep the /ʒ/ as in measure, followed by a light /ən/.
"The chef prepared an herbal infusion by steeping lavender in hot water."
"We received an infusion of nutrients through a slow intravenous infusion."
"Her speech was an infusion of confidence after the rehearsal."
Infusion is pronounced in-ˈfjuː-ʒən in US and UK. The primary stress is on the second syllable: in-FU-sion. Break it into: /ɪn/ + /ˈfjuː/ + /ʒən/. The /juː/ is a long vowel formed by the /f/ plus /j/ glide, and the final /ʒən/ sounds like the “sion” in vision. For clarity, think: IN- FYOU - zhun, with the 'zh' sound like in measure. Audio references you can consult include Cambridge and Oxford dictionaries’ pronunciation audio.
Two common errors: misplacing stress, pronouncing the /juː/ as /ju/ with an abrupt glide (say in-FU-zhen instead of in-FYU-zhn); and flattening the /ʒ/ into /z/ or /ʃ/. To correct: keep the /ˈfjuː/ sequence with a smooth glide, ensure the /ʒ/ at the end is voiced and not a /z/ or /ʃ/; finally, maintain a light, unstressed final syllable. Practice with minimal pairs and slow repetition to secure the correct vowel length and consonant blending.
Across US, UK, and AU, the main variation is vowel quality in the /juː/ sequence and rhoticity. US typically preserves a strong /juː/ with a clear y-glide; UK tends to a slightly shorter, more centralized /juː/ and less rhoticity in some regional accents; Australian often has a broader, more diffuse /juː/ with a catchier /ɪ/ in the first syllable. The final /ʒən/ remains consistent, but the preceding vowel may shift slightly in length and quality due to accent. Refer to IPA: US /ɪnˈfjuːzʃən/, UK /ɪnˈfjuːˌzən/; AU /ɪnˈfjuːzɪən/ depending on speaker.
The difficulty lies in the /fjuː/ cluster and the /ʒən/ suffix. The /f/ blends into a /fj/ or /fju/ glide; many speakers mishear it as /ˈɪn.fjuːzən/ with incorrect syllable stress or mispronounce /ʒ/ as /z/ or /ʃ/. Also, the final unstressed schwa-like /ən/ reduces quickly in casual speech, which can blur the ending. Focus on maintaining the /ʒ/ sound and an audible but light final /ən/.
A unique aspect is the /juː/ sequence after /f/ that can be reduced in rapid speech, sometimes sounding like an /ju/ or even a semivowel in accelerated phrases. You might hear people say in- fyo͞o - zən in casual speech. Emphasize the second syllable with a clean /ˈfjuː/ and keep the /ʒən/ distinct, even when the final vowel reduces in connected speech.
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- US: Rhotic tendency affects vowel length and rhythm; stress remains on FU. Use a clear /ɹ/ quality before the vowel, avoid adding extra r-coloring to the /juː/. - UK: Slightly more clipped final syllable and less rhotics; ensure /ˈfjuː/ is maintained with a crisp /ʒən/ ending; maintain non-rhoticity in standard RP. - AU: More relaxed vowel sounds; /ɪn/ might be slightly shorter; keep the /ˈfjuː/ intact; ensure the /ʒ/ is clearly heard rather than merged into /z/. - Vowel and consonant timing matters: the sequence /ɪnˈfjuːzjən/ appears in some variants; aim for /ɪnˈfjuːzən/ or /ɪnˈfjuːzɪən/ depending on rhythm.
Infusion comes from Middle French infusion, from Latin infused-, past participle of infundere meaning to pour in or pour upon. Infundere itself is a compound of in- (into) and fundere (to pour). The sense developed in English around the 14th century, originally referring to the pouring of liquid into another substance or the act of steeping to extract flavor. Over time, infusion broadened to cover medicinal contexts (infusing drugs or nutrients into bodies) and figurative uses (an infusion of ideas or energy). The word’s trajectory mirrors related terms like infusion, infusionary, and infused, with the modern sense balancing both culinary/medical contexts and figurative “influence” or “gradual introduction.” First known use in English appears in texts from the late medieval period, with clear pharmacological and culinary connotations emerging in early modern culinary and apothecary writings. The term’s evolution consolidates the idea of gradual incorporation as a mechanism to transfer properties—flavor, medicine, or influence—via pouring or steeping processes. Today, infusion remains common in healthcare, gastronomy, and metaphorical language about imparting qualities or effects through gradual integration.
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Words that rhyme with "infusion"
-ion sounds
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