1. PM (noun): The time period from noon to midnight in the 12-hour clock system, commonly used to distinguish afternoon and evening hours. 2. Pm (noun): The chemical symbol for promethium, a rare-earth element with atomic number 61. 3. PM (abbreviation): A widely used abbreviation for the title "prime minister," referring to the head of […] The post PM: Definition, Meaning, and Examples appeared first on US Dictionary.
