5 syllables: ir, ra, di, a, tion. Stress on a.
ir-ay-dee-AY-shuhn
/ˌɪˌɹeɪdiˈeɪʃən/
irradiation is pronounced ir-ay-dee-AY-shuhn (/ˌɪˌɹeɪdiˈeɪʃən/). It has five syllables (ir-ra-di-a-tion), with the stress on "a". Irradiation refers to the process of exposing something to radiation, or the distribution of radiation from a source. In physics and biology, it can denote deliberate exposure in treatment or research, or the spread of radiant energy. The term combines the root ideas of radiation with the -tion suffix, indicating the action or process. It is used in technical, scientific, and medical contexts.
Irradiation refers to the process of exposing something to radiation, or the distribution of radiation from a source. In physics and biology, it can denote deliberate exposure in treatment or research, or the spread of radiant energy. The term combines the root ideas of radiation with the -tion suffix, indicating the action or process. It is used in technical, scientific, and medical contexts.
"The irradiation of the meal package helps preserve freshness and safety."
"Cancer therapy often involves targeted irradiation to destroy malignant cells."
"Researchers studied the irradiation of materials to understand radiation effects."
Break it as i-RAD-i-A-tion. Primary stress on the third syllable: /ɪˌreɪdiˈeɪʃən/ in US/UK, with subtle secondary stress on the middle i. Start with a short initial vowel /ɪ/, then /ˌreɪ/ as a rapid 'ray' sound, /di/ as a quick 'dee', /ˈeɪ/ the long A in 'ation', and end with /ʃən/ like 'shun'. In practice: ih-RAY-dee-AY-shuhn. For clarity, listen to a clear recording; many dictionaries provide audio: Pronounce, Cambridge, and Oxford can be consulted for accuracy.
Common errors include misplacing stress (say-ing i-RAY-dee-AY-shən instead of i-RAD-i-AY-shən), pronouncing /ɪˈreɪdiˌeɪʃən/ with irregular vowel sounds (confusing /eɪ/ with /iː/), and merging syllables too quickly (skipping the /di/ or /ə/). Correct by emphasizing the /ˈeɪ/ in the fourth syllable, ensuring the /ˈeɪ/ is not reduced, and articulating /ʃən/ clearly at the end. Use slow-motion practice with IPA in your mouth-position checks.
In US and UK, the core is /ˌɪˌreɪdiˈeɪʃən/, with the major difference in rhoticity: US typically maintains /ɹ/ after an initial vowel; UK tends to a non-rhotic /r/ realization in some contexts though many speakers articulate /r/ in borrowed terms. Australian pronunciation tends to a flatter vowel quality and a slightly slower /eɪ/ sequence, with /ə/ reductions in unstressed syllables. Overall, the rhythm is similar; the primary differences are vowel quality and rhoticity. Listen to native speakers and compare with Forvo or YouGlish to feel the nuance.
Two main challenges: the three-part vowel-consonant sequence around /r/ and /d/ combined with the /eɪ/ sequence can tripping your tongue, and the final /ʃən/ cluster can feel abrupt after an /eɪ/. The word has multiple syllables with a mix of long and short vowels, and the stress falls on a non-final syllable, which is less intuitive. Focus on the /ˌreɪ/ and /ˈeɪ/ segments, ensure the /d/ is clearly released, and finish with a crisp /ʃən/.
Note the weak second syllable: irradiation has the form i-RAD-i-A-tion, with the primary stress on the third syllable. The /d/ is an alveolar stop that should be clearly released, not swallowed. The sequence /diˈeɪ/ can trick speakers into selling the /d/ short; keep it audible before the long /eɪ/. The final /ʃən/ should be light but present, ensuring the word ends with a clean nasal-fricative blend.
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Irradiation comes from the Latin radix radi-, meaning ray or beam, and the suffix -ation, denoting action or resulting state. The root radi- is tied to rays or radiant energy, found in words like radiation and radiance. The form irradiate (to expose to radiation) first appeared in English around the 19th century, adopted into the noun irradiation by adding -ation to the verb irradiate, aligning with typical agentive noun formation in scientific terminology. The concept of irradiation as exposure to rays has long scientific precedent, with early developments in X-ray research and radioactivity in the late 19th and early 20th centuries. The term gained broader medical, industrial, and environmental usage as technologies for controlled radiation exposure evolved, particularly in cancer therapy, sterilization, and materials processing. First known uses in print appear in scientific literature from the late 1800s to early 1900s, expanding rapidly with modern radiology, nuclear physics, and industrial irradiation methods. Current usage covers both deliberately harnessed energy applications and the study of radiation effects on matter and living tissue, maintaining a precise, technical tone in professional contexts.
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Words that rhyme with "irradiation"
-ion sounds
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