Etymology
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ma

childish or colloquial shortening of mamma, by 1823. "Also applied colloq. to a middle-aged or elderly woman, esp. one in authority" [OED].

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Definitions of ma
1
ma (n.)
informal terms for a mother;
Synonyms: mama / mamma / mom / momma / mommy / mammy / mum / mummy
ma (n.)
a master's degree in arts and sciences;
Synonyms: Master of Arts / Artium Magister / am
ma (n.)
a state in New England; one of the original 13 colonies;
Synonyms: Massachusetts / Bay State / Old Colony / Mass.
2
mA (n.)
one thousandth of an ampere;
Synonyms: milliampere
From wordnet.princeton.edu