- ma, mama, mamma, mom, momma, mommy, mammy, mum, mummy, mater - informal terms for a mother
 --1 is a kind of mother, female parent
 
- Master of Arts, MA, Artium Magister, AM - a master's degree in arts and sciences
 --2 is a kind of master's degree
 
- milliampere, mA - one thousandth of an ampere
 --3 is a kind of current unit
 --3 is a part of ampere, amp, A
- Massachusetts, Bay State, Old Colony, MA - a state in New England; one of the original 13 colonies
 --4 is a kind of American state
 --4 is a part of New England
 --4 has parts: --4 has particulars: Pittsfield; Springfield