Etymology
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pendragon (n.)

"Welsh warlord" (mainly known now via Arthurian romances as the title of Uther Pendragon), late 15c., title of a chief leader in war of ancient Britain or Wales, who were invested with dictatorial powers in times of great danger, from pen "head" (see pen-) + dragon, which figured on the standard of a cohort.

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Oslo 

Norwegian capital city, a name probably based on Old Norse os "estuary, river mouth," in reference to the place's situation.

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Seoul 

South Korean capital, from Korean soul, literally "capital." It was the national capital from 1392 until Japanese annexation in 1910.

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plenipotentiary (adj.)

"invested with, having, or bestowing full power," 1640s, from French plénipotentiaire and directly from Medieval Latin plenipotentiarius "having full power," from Late Latin plenipotens, from Latin plenus "complete, full" (from PIE root *pele- (1) "to fill") + potentem "powerful" (see potent). As a noun from 1650s, "person invested with full powers to transact any business," especially with reference to an ambassador to a foreign court or government, given full power to negotiate a treaty or transact other business.

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Beijing 

Chinese capital, from bei "north" + jing "capital" (as opposed to Nanking, literally "southern capital").

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recursion (n.)

"return, backward movement," 1610s, from Latin recursionem (nominative recursio) "a running backward, return," noun of action from past-participle stem of recurrere "run back" (see recur).

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capitalize (v.)

"write or print in capital letters," 1764, from capital (n.1) + -ize. The meaning "convert (assets) to capital" is recorded from 1868, from capital (n.2). Related: Capitalized; capitalizing.

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payback (n.)

also pay-back, 1946, "net return on profits from an investment," from the verbal phrase, from pay (v.) + back (adj.). Meaning "revenge, retaliation" is by 1957.

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Caracas 

Venezuelan capital, founded 1567 by the Spaniards on the site of a razed village of the Caracas people, whose name is of unknown origin, and named for them.

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Sarajevo 

capital of Bosnia, founded 15c. and named in Turkish as Bosna-Saray, "Palace on the (River) Bosna," from saray (see caravanserai); the modern name is a Slavic adjectival form of saray.

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