As an expert in the English language, I can provide you with the correct usage of the indefinite article before the word "university."
The correct phrase is "a university." The word "university" begins with a vowel sound, and when using an indefinite article, "a" is used before words that start with a consonant sound, while "an" is used before words that start with a vowel sound. However, the rule is based on the sound, not the letter. Since "university" starts with the consonant sound /juː/, "a" is the appropriate article to use.
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