Etymology
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diameter (n.)

late 14c., in geometry, "chord of a circle or sphere which passes through its center; the length of a diameter," from Old French diametre, from Latin diametrus, from Greek diametros (gramme) "diagonal of a circle," from dia "across, through" (see dia-) + metron "a measure" (from PIE root *me- (2) "to measure").

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Definitions of diameter

diameter (n.)
a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface);
diameter (n.)
the length of a straight line passing through the center of a circle and connecting two points on the circumference;
Synonyms: diam
From wordnet.princeton.edu