Chord

Part of speech: noun

Pronunciation: /kɔːd/

Definitions

  1. A straight line segment connecting two points on the circumference of a circle
  2. A line connecting two distinct points on a curve, indicating a geometric relationship, which can also refer to a group of notes played together in harmony
  3. A segment that links two points on a circle's edge | A geometric line that connects two points on a curve, also representing a harmonious combination of musical notes | A line in geometry joining two points on a circular arc, while also denoting a simultaneous sound of multiple musical pitches

Etymology: The term originally referred to a "string" or "gut" stretched on a musical instrument, drawing from the Latin word "chorda," which itself comes from the Greek "χορδή" (khordē). In ancient Greek, this word specifically denoted the gut of an animal, often used for making strings on lyres and other stringed instruments. The physical sense of a tightly drawn string is central to the earliest meanings, emphasizing tension and connection. By the Middle Ages, "chord" in English began to be used more specifically for musical strings, reflecting the growth of musical theory and instrument construction. The word gradually extended its meaning from the individual string to the idea of multiple strings played together, producing harmony. This shift marks the beginning of its modern musical sense: a combination of notes sounded simultaneously. Beyond music, the word took on a fresh geometric meaning in the 17th century, likely influenced by the physical idea of a string stretched tight across a curve. In geometry, a "chord" became the line segment joining two points on a circle or curve. This usage retains the concept of tension and connection—just as a string spans between two points, so does this line segment span across a curve. The mathematical and musical meanings, while distinct, share this common imagery of a connecting line or tensioned string. The pronunciation has remained remarkably stable, reflecting its consistent Latin and Greek roots. The term’s journey from animal gut to abstract geometry highlights the flexibility of words derived from concrete physical objects to complex conceptual tools.

Synonyms: harmony, triad, note