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Chapter:
Correct and Preferred Usage
Author(s):

Roxanne K. Young

The article a is used before the aspirate h (eg, a historic occasion) and nonvocalic y (eg, a ubiquitous organism). Abbreviations and acronyms are preceded by a or an according to the sound following (eg, a UN resolution, an HMO plan). (See also , Abbreviations, Agencies and Organizations.)

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