c.1300, "bail, guarantee, pledge," from O.Fr., "security, surety," from L. cautionem (nom. cautio), from cautus pp. of cavere "to be on one's guard" (see caveat). The Latin sense re-emerged in Eng. 16c.-17c. The verb sense of "to warn" is from 1640s.
"fame, renown," 1799, from Gk. kyddos "glory, fame, renown," from kydos "glory, fame," lit. "that which is heard of" (see caveat). A singular noun in Gk., but the final -s is usually mistaken as a plural suffix in Eng., leading to the barbarous back-formation kudo (first attested 1941).
O.E. dell (perhaps lost and then borrowed in M.E. from cognate M.Du./M.L.G. delle), from P.Gmc. *daljo, related to dale. Uncertain relationship to dell, rogue's cant 16c.-17c. for "a young girl of the vagrant class." "A Dell is a yonge wenche, able for generation, and not yet knowen or broken by the vpright man. ... [W]hen they have beene lyen with all by the vpright man then they be Doxes, and no Dells" [Thomas Harman, "A Caveat or Warning for Common Cursitors," 1567].
1602 (first attested in "Hamlet" iii.2), noun use of adj. sheene "beautiful, bright," from O.E. scene, from P.Gmc. *skauniz (cf. O.H.G. skoni, Ger. schön, O.Fris. skene, M.Du. scone, Du. schoon, Goth. skaunja "beautiful"), from PIE base *skeue- "to pay attention, perceive" (see caveat).
c.1600, from Fr. acoustique, from Gk. akoustikos "pertaining to hearing," from akoustos "heard, audible," from akouein "to hear," from copulative prefix a- + koein "to mark, perceive, hear," from PIE base *(s)keu- "to notice, observe" (see caveat). Acoustic guitar (as opposed to electric) attested by 1958.
O.E. sceawian "to look at, see," from W.Gmc. *skauwojanan (cf. O.S. skauwon "to look at," O.Fris. skawia, Du. schouwen, O.H.G. scouwon "to look at;" Du. schoon, Goth. skaunjai "beautiful," originally "conspicuous"), from P.Gmc. root *skau- "behold, look at," from PIE *skou-, variant of base *skeue- "to pay attention, perceive" (see caveat). Causal meaning "let be seen, put in sight, make known" evolved c.1200 for unknown reasons and is unique to Eng. (Ger. schauen still means "look at"). Spelling shew, popular 18c. and surviving into early 19c., represents obsolete pronunciation (rhymes with view).