Etymology
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inlet (n.)

"narrow opening into a coast, arm of the sea," 1570s, said by old sources to be originally a Kentish term; a special use of Middle English inlate "passage or opening by which an enclosed place may be entered" (c. 1300), from inleten "to let in" (early 13c.), from in + let (v.).

updated on November 30, 2015

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Definitions of inlet from WordNet

inlet (n.)
an arm off of a larger body of water (often between rocky headlands);
Synonyms: recess
inlet (n.)
an opening through which fluid is admitted to a tube or container;
Synonyms: intake
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.