diameter

diameter lat.-grie. ‘Durchmaß, Durchmesser’ ist (s. diametral).

Etymology

From Old French diametre (French diamètre), from Latin diametrus, from Ancient Greek διάμετρος (diámetros) (γραμμή (grammḗ)) (diametros grammē, “line measuring across”), from διά (diá, “across”) + μέτρον (métron, “measure”).

Pronunciation

• (Received Pronunciation) IPA^(key): /daɪˈæmɪtə(ɹ)/
• (General American) enPR: dī-ăm'ĭtər, IPA^(key): /daɪˈæmɪtɚ/, [-mɪɾɚ]

Audio (US)

Duration: 2 seconds.0:02

Noun

diameter (plural diameters)

1. (geometry) Any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.
2. (geometry) The length of such a line.
3. (geometry) The maximum distance between any two points in a metric space
4. (graph theory) The maximum eccentricity over all vertices in a graph.