Definition of "vent"

According to geologists who work in the area, the vents at Castello Aragonese have been spewing carbon dioxide for at least several hundred years, maybe longer.

2014, Elizabeth Kolbert, The Sixth Extinction: An Unnatural History, Picador, page 122

Look, how thy wounds do bleed at many vents.

c. 1602, William Shakespeare, “The Tragedie of Troylus and Cressida”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene iii]

There, at one Paſſage, oft you might ſurvey / A Lye and Truth contending for the vvay; / And long 'tvvas doubtful, both ſo cloſely pent, / VVhich firſt ſhould iſſue thro the narrovv Vent: […]

1715, [Alexander] Pope, The Temple of Fame: A Vision, London: […] Bernard Lintott […], page 41

without the vent of words

1667, John Milton, “Book X”, in Paradise Lost. […], London: […] [Samuel Simmons], […]; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873,

Thou didst make tolerable vent of thy travel.

c. 1604–1605 (date written), William Shakespeare, “All’s Well, that Ends Well”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene iii]

He inveighed against the folly of making oneself liable for the debts of others; vented many bitter execrations against the brother; and concluded with wishing something could be done for the unfortunate family.

1749, Henry Fielding, The History of Tom Jones, a Foundling

But the demonstrators remained defiant, pouring into the streets by the thousands and venting their anger over political corruption, the high cost of living and huge public spending for the World Cup and the Olympics.

2013 June 18, Simon Romero, “Protests Widen as Brazilians Chide Leaders”, in New York Times, retrieved 21 June 2013

Seest, howe brag yond Bullocke beares, So smirke, so smoothe, his pricked eares? […] See howe he venteth into the wynd.

1579, Immeritô [pseudonym; Edmund Spenser], “Februarie. Aegloga Secunda.”, in The Shepheardes Calender: […], London: […] Hugh Singleton, […]; reprinted as H[einrich] Oskar Sommer, editor, The Shepheardes Calender […], London: John C. Nimmo, […], 1890,

Therefore did those nations […] vent such spice.

1614, Walter Ralegh [i.e., Walter Raleigh], The Historie of the World […], London: […] William Stansby for Walter Burre, […], (please specify |book=1 to 5)