Etymology
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chord (n.1)

"related notes in music," 1590s, ultimately a shortening of accord (or borrowed from a similar development in French) and influenced by corde "string of a musical instrument" (c. 1300), which is Latin chorda "catgut, a string" of a musical instrument (see cord (n.)).

English cord as a shortening of accord is attested from mid-14c.; cord meaning "music" is attested in English from late 14c. The spelling with an -h- is first recorded c. 1600, from further confusion with chord (n.2) and perhaps also classical correction. Originally two notes sounded simultaneously; of three or more from 18c.

chord (n.2)

"structure in animals resembling a string," 1540s, alteration of cord (n.), by influence of Greek khorde "gut-string, string of a lyre, tripe," from PIE root *ghere- "gut, entrail."

Meaning "string of a musical instrument" is from 1660s (earlier this was cord). The geometry sense "straight line intersecting a curve" is from 1550s; figurative meaning "feeling, emotion" first attested 1784, from the notion of the heart or mind as a stringed instrument.

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Definitions of chord
1
chord (v.)
play chords on (a stringed instrument);
chord (v.)
bring into consonance, harmony, or accord while making music or singing;
Synonyms: harmonize / harmonise
2
chord (n.)
a straight line connecting two points on a curve;
chord (n.)
a combination of three or more notes that blend harmoniously when sounded together;
From wordnet.princeton.edu