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Mammalia (n.)

"the class of Vertebrata containing all those animals which suckle their young and no other animals," 1773, from Modern Latin (Linnaeus, 1758), from neuter plural of Late Latin mammalis "of the breast," from mamma "breast," from PIE *mama and cognate with mamma. Also see -a (2)).

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Definitions of Mammalia from WordNet

Mammalia (n.)
warm-blooded vertebrates characterized by mammary glands in the female;
Synonyms: class Mammalia
From wordnet.princeton.edu