Definitions of ma:

• noun:   informal terms for a mother
• noun:   a master's degree in arts and sciences
• noun:   one thousandth of an ampere
• noun:   a state in New England; one of the original 13 colonies
• name:  A female given name (rare: 1 in 12500 females; popularity rank in the U.S.: #1036)
• name:  A surname (rare: 1 in 25000 families; popularity rank in the U.S.: #3375)