"mother," a word used especially by children and infants, 1570s, representing the native form of the reduplication of *ma- that is nearly universal among the Indo-European languages (Greek mamme "mother, grandmother," Latin mamma, Persian mama, Russian and Lithuanian mama "mother," German Muhme "mother's sister," French maman, Welsh mam "mother").
Probably a natural sound in baby-talk, perhaps imitative of sound made while sucking. Its late appearance in English is curious, but Middle English had mome (mid-13c.) "an aunt; an old woman," also an affectionate term of address for an older woman.
In educated usage, the stress is always on the last syllable. In terms of the recorded appearance of the variant or related words in English, mama is from 1707, mum is from 1823, mummy in this sense from 1839, mommy 1844, momma 1810, and mom 1867. Mamma's boy "soft, effeminate male" is by 1901.
childish or colloquial shortening of mamma, by 1823. "Also applied colloq. to a middle-aged or elderly woman, esp. one in authority" [OED].
"of or pertaining to a breast," 1680s, from French mammaire (18c.) or Medieval Latin mammarius, from Latin mamma "breast" (see mamma).
word-forming element meaning "breast," from Latin mamma "breast" (which is cognate with mamma). The form mammato-, used in cloud terminology in reference to smooth, rounded shapes, is from Latin mammatus.
1707, spelling variant of mamma. Meaning "sexually attractive woman" is attested by 1925 in African-American vernacular. Mamasan "woman in a position of authority," especially "woman in charge of a geisha-house" is by 1949, with Japanese san, an honorific title. Mama mia! as an exclamation of surprise, etc. is by 1848, from Italian, literally "mother mine!"