Etymology
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latte (n.)

"espresso coffee with milk," by 1990, short for caffè latte, which is an Italian expression meaning "milk coffee," from Latin lac (genitive lactis) "milk" (from PIE root *g(a)lag- "milk"). Compare cafe au lait.

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Definitions of latte

latte (n.)
strong espresso coffee with a topping of frothed steamed milk;
Synonyms: caffe latte
From wordnet.princeton.edu