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AN | definition in the Cambridge English Dictionary
An Definition & Meaning - Merriam-Webster
A vs. An: When to Use Indefinite Articles | Merriam-Webster
'A' and 'An': Which Gets Used Where | Merriam-Webster
AN definition and meaning | Collins English Dictionary
AN Definition & Meaning | Dictionary.com
A, an, and the: how to use articles in English - About Words ...
Indefinite Articles: A and An | Grammarly
When to Use 'A,' 'An,' or 'The' - Gallaudet University
The indefinite article: 'a' and 'an' - LearnEnglish