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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return (v.)

early 14c., returnen, "to come back, come or go back to a former position" (intransitive), from Old French retorner, retourner "turn back, turn round, return" (Modern French retourner), from re- "back" (see re-) + torner "to turn" (see turn (v.)). Also in part from Medieval Latin retornare, returnare.

The transitive sense of "report officially, give an official statement or account" (in answer to a writ or demand) is from early 15c.; "to send (someone or something) back" is by mid-15c.; that of "to turn back" is from c. 1500. Meaning "to give in repayment or recompense" is from 1590s; that of "give back, restore" is from c. 1600. Related: Returned; returning.

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return (n.)

late 14c., "act of coming back" to a place or state, also "formal or official report of election results," from Anglo-French retorn, retourn, Old French retorne, retourne, verbal noun from retorner "turn back, turn round, return" (see return (v.)). Also in part from Medieval Latin returnum. Related: Returns.

The meaning "official report of the result of an election" is from mid-15c. The sense of "act of giving by way of recompense" is from 1540s. In ball games from 1833 (cricket); specifically in tennis from 1886. The meaning "a yield, a profit, gain" in some trade or occupation is recorded from 1620s. The sense of "a thing sent back" is from 1875.

To wish someone many happy returns of the day was in Addison (1716). The postal return address, to which an item is to be returned if it could not be delivered, is attested from 1879; return envelope, enclosed for the recipient's reply to a letter, is by 1886. The traveler's return ticket is by 1847.

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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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-on 

subatomic particle suffix, from ion.

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on- 

the preposition and adverb on used as a prefix; Old English on-, an-.

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on (prep., adv.)

"in a position above and in contact with; in such a position as to be supported by;" also noting the goal to which some action is or has been directed; "about, concerning, regarding; in a position to cover;" as an adverb, "in or into a position in contact with and supported by the top or upper part of something; in or into place; in place for use or action; into movement or action; in operation," Old English on, unstressed variant of an "in, on, into," from Proto-Germanic *ana "on" (source also of Dutch aan, German an, Gothic ana "on, upon"), from PIE root *an- (1) "on" (source also of Avestan ana "on," Greek ana "on, upon," Latin an-, Old Church Slavonic na, Lithuanian nuo "down from").

Also used in Old English in many places where we now would use in. From 16c.-18c. (and still in northern England dialect) often reduced to o'. Phrase on to "aware" is from 1877.

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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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