Shortened form of America or American, particularly as used in commercial names. / Shortened form of amateur, particularly as used in commercial names.

Abbreviation of Amazonas (state of Brazil) / (music) Initialism of Arctic Monkeys.

(timekeeping) Initialism of Anno Mundi. (Latin for in the year of the world)

(sometimes lower case, often punctuated) Initialism of ante meridiem (borrowed from Latin); before noon.

(education) Initialism of Artium Magister. / (education) Initialism of Master of Arts.

Alternative spelling of a.m.

(informal or dialectal) Contraction of I am.

first-person singular present indicative of be

(law) Abbreviation of America. / (law) Abbreviation of American.

Nonstandard form of ham.