AM Full Form is “Ante Meridiem,” a Latin phrase for “before midday.” It denotes the time between midnight and noon, often from 12:00 a.m. to 11:59 a.m. The 12-hour clock system makes distinguishing between the morning and afternoon/evening hours easier by using the abbreviations AM and PM (Post Meridiem). AM explicitly denotes the period between 00:00 and 11:59 a.m., ensuring precision and clarity when describing time.