Meaning

noun informal terms for a mother

noun a master's degree in arts and sciences

noun one thousandth of an ampere

originThe sound, which parents interpret as a reference to themselves, is very commonly made by infants. For more on the linguistic process whereby infants' monosyllables are tied to ancient word roots for parents, see mama, papa, mātēr, and patēr.

Etymology from Wiktionary, CC BY-SA 3.0