1. ma, mama, mamma, mom, momma, mommy, mammy, mum, mummy, mother, female parent

usage: informal terms for a mother

2. Master of Arts, MA, Artium Magister, AM, master's degree

usage: a master's degree in arts and sciences

3. milliampere, mA, current unit

usage: one thousandth of an ampere

4. Massachusetts, Bay State, Old Colony, MA

usage: a state in New England; one of the original 13 colonies

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See also: ma (Dictionary)