The abbreviation "a.m." stands for ante meridiem, which is a Latin term meaning "before noon." However, there are many synonyms for this abbreviation, including "morning," "dawn," "sunrise," and "early hours." These terms describe the time between when the sun comes up until midday. Other common synonyms for "a.m." include "pre-dawn," "early morning," and "daybreak." These words can be used in various ways, such as when setting an alarm clock or scheduling an appointment. Regardless of which synonym is used, they all refer to the period of time before noon.