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The pronunciation of any word in English (or any language at all) is not Universal.  This is because there are many different dialects of The English Language — both throughout America, and also world-wide.  The pronunciations that are presented on GiveMeSomeEnglish!!! are based-upon a combination of both “common usage”, and the most neutral accent used in The International Common Tongue — a.k.a. “American English”.
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Attention – For this word:  the “A” is pronounced as a u-schwa;  the “tt” combination is pronounced simply like the single letter “t” (this is one of two standard pronunciations of this letter combination in The Common Tongue);  the “e” is short;  and for the “-tion” suffix – the “ti” combination is pronounced like the un-voiced “sh” combination;  and the “o” is pronounced as an i-schwa (this is the standard pronunciation of this suffix in The Common Tongue).

– /uh-TEHN-shihn/ – /ə(ʌ)ˈtɛn.ʃə(ɪ)n/ – Notice also that the stress is on the second syllable –

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Learn More About The Word “Attention” On Wiktionary

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