late 14c., "pleasing combination of sounds, harmony," from Old French consonance (12c.) "consonance, rhyme" and directly from Latin consonantia "harmony, agreement," from consonantem (nominative consonans) "agreeing in sound," present participle of consonare "to sound together, sound aloud" (see consonant (adj.)).
From early 15c. as "agreement among persons as to facts or opinions." Meaning "accord or agreement of sounds in words or syllables" is from 1580s.
early 13c., descorde, "unfriendly feeling, ill will;" also "dissension, strife," from Old French descorde (12c.) "disagreement," from Latin discordia, from discors (genitive discordis) "disagreeing, disagreement," from dis- "apart" (see dis-) + cor (genitive cordis) "heart," from PIE root *kerd- "heart."
Musical sense "want of harmony between two notes sounded together; a combination of notes not in harmony with one another" is from late 14c.
1818, "melodious;" by 1823, "pertaining to the melody" (as distinguished from the harmony), from French mélodique, from Late Latin melodicus, from Greek melodikos, from melodia (see melody). Related: Melodical "melodious" (1590s).
supersonic passenger airliner operating from 1976 to 2003, from French concorde, literally "harmony, agreement" (see concord (n.)), reflecting the Anglo-French collaborative agreement that produced it.
mid-15c., discanten, "to run a variety with the voice in harmony with a musical theme, sing in counterpoint," from descant (n.). Sense of "to comment at length, make copious and varied comments" is attested by 1640s.