diameter

Reading level: hard

Estimated CEFR level: B2 — Upper-Intermediate

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun the length of a straight line passing through the center of a circle and connecting two points on the circumference
  2. noun 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)

Etymology

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

In classic literature

Synonyms

diam

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