capitalyoudaoicibaDictYouDict[capital 词源字典]
capital: [13] Etymologically, capital is something that is at the top or ‘head’; it comes from Latin caput ‘head’. The various current English uses of the word reached us, however, by differing routes. The first to come was the adjective, which originally meant simply ‘of the head’ (Milton in Paradise lost wrote of the Serpent’s ‘capital bruise’, meaning the bruise to its head); this came via Old French capital from Latin capitālis, a derivative of caput.

The other senses of the adjective have derived from this: ‘capital punishment’, for instance, comes from the notion of a crime which, figuratively speaking, affects the head, or life. Its use as a noun dates from the 17th century: the immediate source of the financial sense is Italian capitale. The architectural capital ‘top of a column’ (as in ‘Corinthian capitals’) also comes from Latin caput, but in this case the intermediate form was the diminutive capitellum ‘little head’, which reached English in the 14th century via Old French capitel.
=> cattle, chapter, head[capital etymology, capital origin, 英语词源]
capital (adj.)youdaoicibaDictYouDict
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" (see capitulum). Meaning "main, principal, chief, dominant, most important" is from early 15c. in English. Capital letter for an upper case one is attested from late 14c. The modern informal sense of "excellent, first-rate" is dated from 1762 in OED (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.

A capital crime (1520s) is one that affects the life or "head;" capital had a sense of "deadly, mortal" from late 14c. in English, a sense also found 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. Capital gain is recorded from 1921. Capital goods is recorded from 1899. Related: Capitally.
capital (n.1)youdaoicibaDictYouDict
early 15c., "a capital letter," from capital (adj.). The meaning "capital city" is first recorded 1660s (the Old English word was heafodstol). The financial sense is from 1610s (Middle English had chief money "principal fund," mid-14c.), from Medieval Latin capitale "stock, property," noun use of neuter of capitalis "capital, chief, first." (The noun use of this adjective in classical Latin was for "a capital crime.")
[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, pecuniary.
capital (n.2)youdaoicibaDictYouDict
"head of a column or pillar," late 13c., from Anglo-French capitel, Old French chapitel, or directly from Latin capitellum "little head," diminutive of caput (see capitulum).