The Collaborative International Dictionary of English v.0.48:

Ma \Ma\ (m[aum]), n. [Cf. Mamma.]
   1. A child's word for mother.
      [1913 Webster]

   2. [Hind.] In Oriental countries, a respectful form of
      address given to a woman; mother. --Balfour (Cyc. of
      India).
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ma \Ma\, conj. [It.] (Mus.)
   But; -- used in cautionary phrases; as, "Vivace, ma non
   troppo presto" (i. e., lively, but not too quick). --Moore
   (Encyc. of Music).
   [1913 Webster]

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]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "ma":
   dam, foster mother, genetrix, mam, mama, mammy, mater,
   materfamilias, maternal ancestor, matriarch, mom, mommy, mother,
   mummy, old lady, old woman, stepmother, the old woman



The Free On-line Dictionary of Computing (30 December 2018):

ma

    The country code for Morocco.

   (1999-01-27)