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    • Join Date: Feb 2007
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    #1

    Using "a" or "an" with initialisms starting with consonants that sound like vowels

    In writing using initialisms starting with "S" do you use "a" or "an". In particular, I am talking about an initialism like STI or STD. Do you write "an STI" or "a STI"?

  1. Ouisch's Avatar
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    • Join Date: Mar 2006
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    #2

    Re: Using "a" or "an" with initialisms starting with consonants that sound like vowels

    You would say "an" STD. If the phonetic pronunciation of a letter begins with a vowel sound (such as M [em], S [ess], N [en], etc) then "an" is used.

  2. Casiopea's Avatar

    • Join Date: Sep 2003
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    #3

    Re: Using "a" or "an" with initialisms starting with consonants that sound like vowels

    Welcome, health professional.

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