From WordNet (r) 3.0 (2006):
ma
n 1: informal terms for a mother [syn: ma, mama, mamma,
mom, momma, mommy, mammy, mum, mummy]
2: a master's degree in arts and sciences [syn: Master of
Arts, MA, Artium Magister, AM]
3: one thousandth of an ampere [syn: milliampere, mA]
4: a state in New England; one of the original 13 colonies [syn:
Massachusetts, Bay State, Old Colony, MA]