AP STYLE: a, an

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"A" is used before consonant sounds, regardless of spelling.

"An" is used before vowel sounds.

A one-year duration ... ("one" begins with "w" sound)
A united effort ... (the beginning of "united" sounds like "you")

An energetic performance ...
An honorable solution ... (the "h" is silent)
An NFL game ... ("N" sounds like it starts with "e" or "i")
An 1873 photograph ... (eighteen starts with "e")

> AP Stylebook

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Key Words: AP Style, a, an, Proofreading, Copy Editing, Writing

Computer Keyboard and Hands Typing, adapted from image at nps.gov