Etymology
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void (n.)
1610s, "unfilled space, gap," from void (adj.). Meaning "absolute empty space, vacuum" is from 1727.
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void (v.)
"to clear" (some place, of something), c. 1300, from Anglo-French voider, Old French vuider "to empty, drain; to abandon, evacuate," from voide (see void (adj.)); meaning "to deprive (something) of legal validity" is attested from early 14c. Related: Voided; voiding.
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void (adj.)
c. 1300, "unoccupied, vacant," from Anglo-French and Old French voide, viude "empty, vast, wide, hollow, waste, uncultivated, fallow," as a noun, "opening, hole; loss," from Latin vocivos "unoccupied, vacant," related to vacare "be empty," from PIE *wak-, extended form of root *eue- "to leave, abandon, give out." Meaning "lacking or wanting" (something) is recorded from early 15c. Meaning "legally invalid, without legal efficacy" is attested from mid-15c.
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*eue- 
*euə-, Proto-Indo-European root meaning "to leave, abandon, give out," with derivatives meaning "abandoned, lacking, empty."

It forms all or part of: avoid; devastation; devoid; evacuate; evanescent; vacant; vacate; vacation; vacuity; vacuole; vacuous; vacuum; vain; vanish; vanity; vaunt; void; wane; want; wanton; waste.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit una- "deficient;" Avestan va- "lack," Persian vang "empty, poor;" Armenian unain "empty;" Latin vacare "to be empty," vastus "empty, waste," vanus "empty, void," figuratively "idle, fruitless;" Old English wanian "to lessen," wan "deficient;" Old Norse vanta "to lack."
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profitless (adj.)

"void of profit, gain, or advantage," 1590s, from profit (n.) + -less.

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vacate (v.)
1640s, "to make void, to annul," from Latin vacatus, past participle of vacare "be empty, be void," from PIE *wak-, extended form of root *eue- "to leave, abandon, give out." Meaning "to leave, give up, quit" (a place) is attested from 1791. Related: Vacated; vacating.
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tenesmus (n.)
"a straining" (to void the contents of the bowels), 1520s, medical Latin, from Greek tenesmos "a straining," from teinein "to stretch," from PIE root *ten- "to stretch."
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impassive (adj.)
1660s, "not feeling pain, insen" from assimilated form of in- "not, opposite of" (see in- (1)) + passive. Meaning "void of emotions, unmoved" is from 1690s. Related: Impassively; impassiveness (1640s).
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cassate (v.)
"to vacate, annul, make void," 1510s, from Late Latin cassatus, past participle of cassare, from Latin quassare "annul, quash" (see quash). Related: Cassated; cassating.
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