Definitions:

1. It is used to indicate the morning hours in the 12-hour clock system. NOUN
   • The meeting is scheduled for 10 A.M.
2. Refers to the time period from midnight to noon. ADJECTIVE
   • I'm going to meet my friends at 8 A.M.
3. Stands for the Latin phrase 'ante meridiem' which translates to 'before noon' or 'before midday'. adverb
   • let's meet at 11 A.M.

Synonyms:

• ante meridiem