Meaning

noun a straight line connecting two points on a curve

noun a combination of three or more notes that blend harmoniously when sounded together

verb play chords on (a string instrument)

originVariant of cord, with spelling alteration due to Latin chorda (“cord”), ultimately from Ancient Greek χορδή (khordḗ, “string of gut, the string of a lyre”). No relation to French accord (“chord”) and its derivations. Doublet of cuerda.

Etymology from Wiktionary, CC BY-SA 3.0