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diameter

noun
dy-AM-i-ter/daɪˈæmɪdɚ/UKdy-AM-i-tuh/daɪˈæmɪtə(ɹ)/

Pluraldiameters

4 meanings of diameter

Practice

  1. 1
    nouncountable
    The distance across a circle or round object, measured straight through its middle.

    The wheel is about two feet in diameter.

    What is the diameter of this coin?

    Note
  2. 2
    nouncountable
    A straight line that goes from one side of a circle to the other through the middle.

    Use a ruler to draw a diameter through the middle of the circle.

    The diameter cuts the circle into two equal parts.

    Note
  3. 3
    nouncountable
    In math, the longest distance between any two points of a space.

    If you add a point far from the others, the diameter of the whole set gets bigger.

    With the usual way of measuring, the diameter of a square is the length of its diagonal.

    Note
  4. 4
    nouncountable
    In a graph, the largest number of steps between two points, always going the shortest way.

    This graph has a diameter of three.

    A small diameter means that any two points are only a few steps apart.

    Note

Practice

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Origin

It comes from a Greek word meaning "line measuring across", made from words for "across" and "measure".