| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
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| A.M. |
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| ABBREVIATION: | 1. airmail 2. or a.m. Latin anno mundi (in the year of the world) 3. also a.m. or a.m. ante meridiem | | USAGE NOTE: | By definition, 12 a.m. denotes midnight, and 12 p.m. denotes noon, but there is sufficient confusion over these uses to make it advisable to use 12 noon and 12 midnight where clarity is required.
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| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. |
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