en.wikipedia.org/wiki/12-hour_clock

The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. and p.m. Each period consists of 12 hours numbered: ...

www.timeanddate.com/time/am-and-pm.html

What do AM and PM mean on a clock? Is noon 12 pm and midnight 12 am? How do times on a 12-hour clock relate to the 24-hour format?

www.merriam-webster.com/dictionary/am

Am definition is - present tense first-person singular of be.

www.amazon.com/AM-Arctic-Monkeys/dp/B00DKY4LBW

Arctic Monkeys release their fifth album, entitled AM. AM was produced by James Ford and co-produced by Ross Orton at Sage & Sound Recording, LA and ...

en.oxforddictionaries.com/definition/am

Definition of am - ... Main definitions of am in English. : amAmAM. am1. first person singular present of be. Pronunciation. am. /am/. Main definitions of am in ...

en.oxforddictionaries.com/definition/a.m.

Definition of a.m. - before noon (used after times of day between midnight and noon that are not expressed using the 24-hour clock)

en.wiktionary.org/wiki/am

The first-person present singular form am(u), along with some other inflected forms, may have been analogical constructions (in this case, from an old form ...

www.dictionary.com/browse/am

Am definition, 1st person singular present indicative of be. See more.

www.dictionary.com/browse/a-m-

The abbreviation a.m. for Latin ante meridiem, meaning “before noon,” refers to the period from midnight until noon. One minute before noon is 11:59 a.m. One ...