• n. （打字機等的）鍵；關鍵；鑰匙
• vt. 鍵入；鎖上；調節…的音調；提供線索
• vi. 使用鑰匙
• adj. 關鍵的
• n. (Key)人名；(英)基；(德、荷、瑞典)凱

來自古英語caeg,鑰匙，可能來自Proto-Germanic*ki,劈開，分開，來自PIE*ke,使鋒利，磨，詞源同cone,hone.后用于指鑰匙，引申詞義琴鍵，鍵盤，比喻義關鍵，核心。

key

key: [OE] The Old English ancestor of key was c?g. This produced a modern English word which to begin with was pronounced to rhyme with bay, and its present-day pronunciation, rhyming with bee, did not come to the fore until the 18th century. No one knows where the word originally came from; it has no living relatives in other Germanic languages.

key (n.1)

"metal piece that works a lock," from Old English c?g "key," of unknown origin, with no certain cognates other than Old Frisian kei. Perhaps related to Middle Low German keie "lance, spear" on notion of "tool to cleave with," from Proto-Germanic *ki- "to cleaver, split" (cognates: German Keil "wedge," Gothic us-kijans "come forth," said of seed sprouts, keinan "to germinate"). But Liberman writes, "The original meaning of *kaig-jo- was presumably '*pin with a twisted end.' Words with the root *kai- followed by a consonant meaning 'crooked, bent; twisted' are common only in the North Germanic languages." Modern pronunciation is a northern variant predominating from c. 1700; earlier it was often spelled and pronounced kay.

Figurative sense of "that which serves to open or explain" was in Old English; meaning "that which holds together other parts" is from 1520s. As "answer to a test," it is from chess, short for key move, "first move in a solution to a set problem." Musical sense of "tone, note" is 15c., but modern sense of "scale" is 1580s, probably as a translation of Latin clavis or French clef (see clef; also see keynote). Extended c. 1500 to "mechanism on a musical instrument." As a verb meaning "to scratch (a car's paint job) with a key" it is recorded by 1986.

key (n.2)

"low island," 1690s, from Spanish cayo "shoal, reef," from Taino cayo "small island;" spelling influenced by Middle English key "wharf" (c. 1300), from Old French kai "sand bank" (see quay).

1. The key issue was whether the four defendants acted dishonestly.

關鍵問題是4名被告是否存在欺詐行為。

來自柯林斯例句

2. For a beach resort with a difference, try Key West.

如果想去一個與眾不同的海濱度假勝地，那就去基韋斯特吧。

來自柯林斯例句

3. He unlocked her door and handed her back the key.

他給她打開門鎖，并把鑰匙交還給她。

來自柯林斯例句

4. The key to his success is his logical mind.

他成功的關鍵在于他擅長邏輯思維。

來自柯林斯例句

5. At these conventions, executives fraternized with the key personnel of other banks.

在這些集會上，主管們和其他銀行的重要人員友善往來。

來自柯林斯例句