Etymology
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capital (adj.)

early 13c., "of or pertaining to the head," from Old French capital, from Latin capitalis "of the head," hence "capital, chief, first," from caput (genitive capitis) "head" (from PIE root *kaput- "head"). The meaning "main, principal, chief, dominant, first in importance" is from early 15c. in English. The modern informal sense of "excellent, first-rate" is by 1754 (as an exclamation of approval, OED's first example is 1875), perhaps from earlier use of the word in reference to ships, "first-rate, powerful enough to be in the line of battle," attested from 1650s, fallen into disuse after 1918. Related: Capitally.

A capital letter "upper-case latter," of larger face and differing more or less in form (late 14c.) is so called because it stands at the "head" of a sentence or word. Capital gain is recorded from 1921. Capital goods is recorded from 1899.

A capital crime or offense (1520s) is one that involves the penalty of death and thus affects the life or "head" (capital had a sense of "deadly, mortal" from late 14c. in English, as it did earlier in Latin). The felt connection between "head" and "life, mortality" also existed in Old English: as in heafodgilt "deadly sin, capital offense," heafdes þolian "to forfeit life." Capital punishment was in Blackstone (1765) and classical Latin capitis poena.

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Africa (n.)

Latin Africa (terra) "African land, Libya, the Carthaginian territory, the province of Africa; Africa as a continent," fem. of adjective Africus, from Afer "an African," a word of uncertain origin. The Latin word originally was used only in reference to the region around modern Tunisia; it gradually was extended to the whole continent. Derivation from a Phoenician cognate of Arabic afar "dust, earth" is tempting. The Middle English word was Affrike.

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central (adj.)

1640s, "pertaining to or being a center," also "being that from which other related things proceed," from French central or directly from Latin centralis "pertaining to a center," from centrum (see center (n.)). Centrally is attested perhaps as early as early 15c., which might imply a usage of central earlier than the attested date.

Slightly older is centric (1580s). As a U.S. colloquial noun for "central telephone exchange," first recorded 1889 (hence, "Hello, Central?"). Central processing unit attested from 1961. Central America is attested from 1826.

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capital (n.3)

"head of a column or pillar," late 13c., from Anglo-French capitel, Old French chapitel (Modern French chapiteau), or directly from Latin capitellum "head of a column or pillar," literally "little head," diminutive of caput "head" (from PIE root *kaput- "head").

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capital (n.1)

early 15c., "a capital letter," from capital (adj.). The meaning "city or town which is the official seat of government" is recorded from 1660s (the Old English word was heafodstol; Middle English had hevedburgh). For the financial sense see capital (n.2).

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capital (n.2)

1610s, "a person's wealth," from Medieval Latin capitale "stock, property," noun use of neuter of Latin capitalis "capital, chief, first" (see capital (adj.)). From 1640s as "the wealth employed in carrying on a particular business," then, in a broader sense in political economy, "that part of the produce of industry which is available for further production" (1793).

[The term capital] made its first appearance in medieval Latin as an adjective capitalis (from caput, head) modifying the word pars, to designate the principal sum of a money loan. The principal part of a loan was contrasted with the "usury"—later called interest—the payment made to the lender in addition to the return of the sum lent. This usage, unknown to classical Latin, had become common by the thirteenth century and possibly had begun as early as 1100 A.D., in the first chartered towns of Europe. [Frank A. Fetter, "Reformulation of the Concepts of Capital and Income in Economics and Accounting," 1937, in "Capital, Interest, & Rent," 1977]

Also see cattle, and compare sense development of fee, and pecuniary. Middle English had chief money "principal fund" (mid-14c.). The noun use of the adjective in classical Latin meant "a capital crime."

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capital letter (n.)

late 14c.; see capital (adj.). So called because it is at the "head" of a sentence or word.

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South Africa 

1815 as a name for a distinct region that had been partly settled by Europeans; 1910 as the name of a nation.

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Sens 

city in north-central France, Roman Senones, the capital of the Gaulish people of the same name.

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okapi (n.)

short-necked, stripe-legged giraffe of central Africa, 1900, from the animal's name in Mbuba (Congo). Reported by English explorer Sir Harry Johnston.

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