chord

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Music A combination of three or more pitches sounded simultaneously.
• noun Harmony, as of color.
• intransitive verb Music To play chords.
• intransitive verb To play chords on.
• intransitive verb To produce by playing musical chords; harmonize.
• noun A line segment that joins two points on a curve.
• noun A straight line connecting the leading and trailing edges of an airfoil.
• noun An emotional feeling or response.
• noun Archaic The string of a musical instrument.

from The Century Dictionary.

• noun A string; a cord. Specifically —
• noun The string of a musical instrument.
• noun A musical tone.—
• noun In music, the simultaneous sounding of three or more tones; specifically, the sounding of three or more tones that are concordant with one another.
• noun Hence Harmony, as of color.
• noun In geometry, a straight line intersecting a curve; that part of a straight line which is comprised between two of its intersections with a curve; specifically, the straight line joining the extremities of an arc of a circle.
• noun A main horizontal member of a bridge-truss.
• noun In anatomy, a cord; a chorda; especially, the notochord, or chorda dorsalis. See chorda.
• To furnish with chords or strings, as a musical instrument.
• In music, to sound harmoniously or concordantly.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb (Mus.) To accord; to harmonize together.
• transitive verb To provide with musical chords or strings; to string; to tune.
• noun The string of a musical instrument.
• noun (Mus.) A combination of tones simultaneously performed, producing more or less perfect harmony, .
• noun (Geom.) A right line uniting the extremities of the arc of a circle or curve.
• noun (Anat.) A cord. See Cord, n., 4.
• noun (Engin.) The upper or lower part of a truss, usually horizontal, resisting compression or tension.
• noun See under Accidental, Common, and Vocal.
• noun See Illust. of Arch.
• noun a chord drawn from any point of a curve, in the circle of curvature for that point.
• noun See Scale.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun music In music, a combination of any three or more notes sounded simultaneously.
• noun geometry A straight line between two points of a curve.
• noun engineering A horizontal member of a truss.
• noun aeronautics The distance between the leading and trailing edge of a wing, measured in the direction of the normal airflow.
• noun computing A keyboard shortcut that involves two or more distinct keypresses, such as Ctrl+M followed by P.
• verb transitive To write chords for.
• verb music To accord; to harmonize together.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb play chords on (a string instrument)
• noun a combination of three or more notes that blend harmoniously when sounded together
• verb bring into consonance, harmony, or accord while making music or singing
• noun a straight line connecting two points on a curve