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Definition of A.m.
1. Adverb. Before noon. "Let's meet at 11 A.M."
2. Adjective. Before noon.
Definition of A.m.
1. Abbreviation. before noon (''used after a time to indicate it is between midnight and noon, i.e., in the morning'') ¹
2. Abbreviation. ad modum (less commonly used) ¹
¹ Source: wiktionary.com