Etymology
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vent (v.)

late 14c., "emit from a confined space," probably a shortening of aventer "expose oneself to the air" (c. 1300), from Old French eventer "let out, expose to air," from Vulgar Latin *exventare, from Latin ex "out" + ventus "wind" (from PIE *wē-nt-o‑ "blowing," suffixed (participial) form of root *we- "to blow").

Sense of "express freely" first recorded 1590s. Sense of "divulge, publish" (1590s) is behind phrase vent one's spleen (see spleen). Related: Vented; venting.

vent (n.)

c. 1400, "anus," from Old French vent from verb eventer (see vent (v.)) and in part from Middle English aventer, from the French verb. Perhaps also merged with or influenced by Middle English fent "opening or slit in a the front of a garment (usually held closed with a brooch)," c. 1400, from Old French fente, from Latin findere "to split" (from PIE root *bheid- "to split"). Meaning "outlet for water," also "air hole, breathing hole" is from mid-15c. Meaning "action of venting" is recorded from c. 1500.

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Definitions of vent
1
vent (n.)
a hole for the escape of gas or air;
Synonyms: venthole / vent-hole / blowhole
vent (n.)
external opening of urinary or genital system of a lower vertebrate;
vent (n.)
a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt;
Synonyms: volcano
vent (n.)
a slit in a garment (as in the back seam of a jacket);
vent (n.)
activity that frees or expresses creative energy or emotion;
he gave vent to his anger
Synonyms: release / outlet
2
vent (v.)
give expression or utterance to;
The graduates gave vent to cheers
She vented her anger
Synonyms: ventilate / give vent
vent (v.)
expose to cool or cold air so as to cool or freshen;
Synonyms: ventilate / air out / air
From wordnet.princeton.edu