Толковый словарь английского языка Oxford English Reference - discord

n. & v. --n. 1 disagreement; strife. 2 harsh clashing noise; clangour. 3 Mus. a a lack of harmony between notes sounding together. b an unpleasing or unfinished chord needing to be completed by another. c any interval except unison, an octave, a perfect fifth and fourth, a major and minor third and sixth, and their octaves. d a single note dissonant with another. --v.intr. 1 (usu. foll. by with) a disagree or quarrel. b be different or inconsistent. 2 jar, clash, be dissonant. Etymology: ME f. OF descord, (n.), descorder (v.) f. L discordare f. discors discordant (as DIS-, cor cord- heart)