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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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Argentinian – For this word:  the “A” is pronounced like the short letter “o”;  the “g” is soft;  the “e” is pronounced as an i-schwa;  the first “i” is short;  and for the “-ian” suffix – the “i” is pronounced like the long letter “e”, there is a phantom consonant letter “y” in-between the “i” and the “a” (this is a product of the transition from one sound to the next), and the “a” is pronounced as an i-schwa (this is the standard pronunciation of this suffix in The Common Tongue).

– /ahr-dʒə(ɪ)n-TIH-nee-yihn/ – /ɑɹ.dʒə(ɪ)n.ˈtɪ.niː.jə(ɪ)n/ – Notice also that the stress is on the third syllable –

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Learn More About The Word “Argentinian” On Wiktionary

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