Etymology
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candidate (n.)

"person who seeks or is put forward for an office by election or appointment," c. 1600, from Latin candidatus "one aspiring to office," originally "white-robed," past participle of candidare "to make white or bright," from candidus past participle of candere "to shine," from PIE root *kand- "to shine." White was the usual color of the Roman toga, but office-seekers in ancient Rome wore a gleaming white toga (togacandida), probably whitened with fine powdered chalk, presumably to indicate the purity of their intentions in seeking a role in civic affairs.

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candied (adj.)
"preserved or encrusted with sugar or anything resembling it," c. 1600, past-participle adjective from candy (v.).
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candle (n.)

"cylindrical body of tallow, wax, etc., formed on a wick and used as a source of artificial light," Old English candel "lamp, lantern, candle," an early ecclesiastical borrowing from Latin candela "a light, torch, candle made of tallow or wax," from candere "to shine," from PIE root *kand- "to shine."

The Latin word is also the source of French chandelle, Spanish candela, Irish coinneal, Welsh canwyll, Russian kandilo, Arabic qandil, etc. Candles were unknown in ancient Greece (where oil lamps sufficed), but common from early times among Romans and Etruscans. Candles on birthday cakes seem to have been originally a German custom. To hold a candle to originally meant "to help in a subordinate capacity," from the notion of an assistant or apprentice holding a candle for light while the master works (compare Old English taporberend "acolyte"). To burn the candle at both ends "consume or waste prodigiously" is recorded from 1730.

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candle-light (n.)
also candlelight, Old English candelleoht "the light of a candle;" from candle + light (n.). As "time at which candles are lit" 1660s, "an expression much used in places or regions where no correct standard of time is easily accessible" [Century Dictionary, 1895].
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Candlemas (n.)
Church festival, late Old English candelmæsse (from candle + mass (n.2)), feast of the purification of the Virgin Mary (Feb. 2), celebrated with many candles, corresponding to Celtic pagan Imbolc.
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candlestick (n.)

also candle-stick, "utensil for holding a candle," Old English candelsticca; see candle + stick (n.). From 1915 in reference to a type of upright telephone common from 1890s to 1940s.

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candle-waster (n.)

"one who wastes candles," specifically a contemptuous word for one who follows occupations considered unprofitable or harmful, 1590s, from candle + agent noun from waste (v.).

A whoreson book-worm, a candle-waster. [Ben Jonson, "Cynthia's Revels"]
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can-do (adj.)
"confident of performance," by 1952, from expression can do "it is possible" (1903), literally "(I or we) can do (it)," which is perhaps based on earlier no can do (see no).
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candor (n.)
"openness of mind, impartiality, frankness, freedom from reserve or disguise," c. 1600, from Latin candor "purity, openness," originally "whiteness, brightness, radiance," from candere "to shine, to be white" (from PIE root *kand- "to shine"). Borrowed earlier in English (c. 1500) with the Latin literal sense "extreme whiteness."
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candour (n.)
chiefly British English spelling of candor (q.v.); for spelling, see -or.
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