Etymology
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espresso (n.)

coffee made under steam pressure, 1945, from Italian (caffe) espresso, from espresso "pressed out," past participle of esprimere, from Latin exprimere "press out, squeeze out" (see express (v.1)). In reference to the steam pressure.

updated on September 26, 2014

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Definitions of espresso from WordNet

espresso (n.)
strong black coffee brewed by forcing hot water under pressure through finely ground coffee beans;
From wordnet.princeton.edu, not affiliated with etymonline.