Etymology
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mom (n.)

"mother," 1867, American English, perhaps a shortening of mommy; also see mamma. Adjectival phrase mom and pop to indicate a small shop or other business run by a married couple is by 1946.

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Definitions of mom

mom (n.)
informal terms for a mother;
Synonyms: ma / mama / mamma / momma / mommy / mammy / mum / mummy
From wordnet.princeton.edu