Definition of "an" [an]

• The form of a used before words beginning with a vowel or with an unpronounced h: an elephant; an hour. See Usage Notes at a2, every. (indefinite-article)
• Archaic And if; if. (conjunction)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Security is an exception..an additional cost..a headwind that slows growth."
• "But kitteh, it iz krunchee an full uv vitimins an nootrishun an guud fer u an..an…o neber mynd, heer, haz sum toona"
• "In an interview, he laughed and described the president’s remarks as “an enthusiastic endorsement."