Etymology
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labour 

chiefly British English spelling of labor (q.v.); for spelling, see -or. With capital L-, short for "the British Labour Party," it is attested from 1892; the party name itself is from 1886.

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endeavour 

chiefly British English spelling of endeavor (q.v.); for spelling, see -or. Related: Endeavoured; endeavoring; endeavours. The U.S. space shuttle was spelled this way because it was named for HMS Endeavour, Capt. Cook's ship.

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savior (n.)

c. 1300, saveour, "one who delivers or rescues from peril," also a title of Jesus Christ, from Old French sauveour, from Late Latin salvatorem (nominative salvator) "a saver, preserver," originally and chiefly Church Latin, with reference to Christ (source also of Spanish salvador, Italian salvatore), from salvatus, past participle of salvare "to save" (see save (v.)). In the New Testament used of both Jesus and God.

In the Christian sense, the Latin noun is a translation of Greek sōtēr "savior." In English, it replaced Old English hælend, literally "healing," likely a loan-translation from Latin, a noun use of the present participle of hælan (see heal). Middle English also had salvatour "Jesus Christ," also "a rescuer" (c. 1300) from the Latin, and compare saver. The conservatism of liturgy sustained the -our spelling (see -or).

The old spelling saviour still prevails even where other nouns in -our, esp. agent-nouns, are now spelled with -or, the form savior being regarded by some as irreverent. [Century Dictionary, 1895] 
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color (n.)

early 13c., "skin color, complexion," from Anglo-French culur, coulour, Old French color "color, complexion, appearance" (Modern French couleur), from Latin color "color of the skin; color in general, hue; appearance," from Old Latin colos, originally "a covering" (akin to celare "to hide, conceal"), from PIE root *kel- (1) "to cover, conceal, save." Old English words for "color" were hiw ("hue"), bleo. For sense evolution, compare Sanskrit varnah "covering, color," which is related to vrnoti "covers," and also see chroma.

Colour was the usual English spelling from 14c., from Anglo-French. Classical correction made color an alternative from 15c., and that spelling became established in the U.S. (see -or). 

Meaning "a hue or tint, a visible color, the color of something" is from c. 1300. As "color as an inherent property of matter, that quality of a thing or appearance which is perceived by the eye alone," from late 14c. From early 14c. as "a coloring matter, pigment, dye." From mid-14c. as "kind, sort, variety, description." From late 14c. in figurative sense of "stylistic device, embellishment. From c. 1300 as "a reason or argument advanced by way of justifying, explaining, or excusing an action," hence "specious reason or argument, that which hides the real character of something" (late 14c.).

From c. 1300 as "distinctive mark of identification" (as of a badge or insignia or livery, later of a prize-fighter, horse-rider, etc.), originally in reference to a coat of arms. Hence figurative sense as in show one's (true) colors "reveal one's opinions or intentions;" compare colors.

In reference to "the hue of the darker (as distinguished from the 'white') varieties of mankind" [OED], attested from 1792, in people of colour, in translations from French in reference to the French colony of Saint-Domingue (modern Haiti) and there meaning "mulattoes."

In reference to musical tone from 1590s. Color-scheme is from 1860. Color-coded is by 1943, in reference to wiring in radios and military aircraft. Color-line in reference to social and legal discrimination by race in the U.S. is from 1875, originally referring to Southern whites voting in unity and taking back control of state governments during Reconstruction (it had been called white line about a year earlier, and with more accuracy).

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deputation (n.)

late 14c., deputacioun, "appointment or authority to represent or act for another or others," noun of action from depute (v.). From 1732 as "person or persons authorized to represent or act for others."

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oratorical (adj.)

"pertaining to an orator or oratory," 1580s, from orator or oratory + -ical, or else from Latin oratorius "pertaining to an orator or to speaking or pleading" (see oratory (n.1)). Related: Oratorically. Earlier form was oratorial (1540s).

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elitism (n.)

"advocacy of or preference for rule or social domination by an elite element in a system or society; attitude or behavior of persons who are or deem themselves among the elite," 1951; see elite + -ism.

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humeral (adj.)

"of or pertaining to humerus; of or pertaining to the or the shoulder," 1610s; see humerus + -al (1).

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publicness (n.)

"character of common possession or interest; openness or exposure to notice or knowledge of the community or of people at large," c. 1600, from public (adj.) + -ness.

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tarsal (adj.)

"of or pertaining to the ankle or instep," 1817, from tarsus (n.) + -al (1), or from medical Latin tarsalis.

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