English Lexicon

Diameter

/daɪˈæm.ɪ.tər/
nounCEFR B2 (Upper)Top #1500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

    "The diameter of the circle is twice the radius."
  2. 2

    The length of such a line.

    "We need to calculate the diameter of the pipe to ensure it fits properly."

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Synonyms (3)
Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

The word 'diameter' originates from the Greek word 'diametros', which means 'across the measure'. It was adopted into Latin as 'diameter' before entering Middle English, reflecting the mathematical concept of measuring across a circle.

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