Etymology
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emasculation (n.)

"the act of depriving a male of the function which characterizes the sex; castration," also more generally "the act of depriving of vigor or strength," 1620s, noun of action from emasculate.

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revitalization (n.)

"act or fact of being given fresh life and vigor, act of revitalizing," 1869, noun of action from revitalize.

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spiritless (adj.)
1560s, "dead," from spirit (n.) + -less. Meaning "having no vigor or vivacity" is from 1650s. Related: Spiritlessly.
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ultra vires 
Latin, literally "beyond powers," from ultra "beyond" (see ultra-) + vires "strength, force, vigor, power," plural of vis (see vim). Usually "beyond the legal or constitutional power of a court, etc."
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vim (n.)
1843, usually said to be from Latin vim, accusative of vis "strength, force, power, vigor, energy," from Proto-Italic *wis-, traditionally from PIE root *weie- "to go after, pursue with vigor or desire," with noun derivatives indicating "force, power" (see gain (v.)) and related to the root of virile. But de Vaan seems to have doubts ("more easily explained from an original root noun"), and based on the early uses OED suggests the possibility that the English word is of "a purely inventive or interjectional origin."
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reinvigorate (v.)

also re-invigorate, "revive vigor in, reanimate," 1650s, from re- "back, again" + invigorate (v.). Related: Reinvigorated; reinvigorating; reinvigoration.

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reanimation (n.)

also re-animation, "reviving from apparent death; act or action of giving fresh spirits or vigor," 1777, from re- "back, again" + animation or else a noun formed to go with reanimate (v.).

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feckless (adj.)
1590s, from feck, "effect, value, vigor" (late 15c.), Scottish shortened form of effect (n.), + -less. Popularized by Carlyle, who left its opposite, feckful, in dialectal obscurity. Related: Fecklessly; fecklessness.
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Evan 
masc. proper name, Welsh form of John, perhaps influenced in form by Welsh ieuanc "young man" (cognate of Latin juvenis), from Celtic *yowanko-, from PIE *yeu- "vital force, youthful vigor" (see young (adj.)).
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blaze (v.1)
"to burst into flame, burn brightly or vigorously," c. 1200, from blaze (n.1). To blaze away "fire (guns or cannon) continuously" is by 1776, hence "work with vigor and enthusiasm." Related: Blazed; blazing.
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