Definitions for diameterdaɪˈæm ɪ tər

This page provides all possible meanings and translations of the word diameter

Random House Webster's College Dictionary

di•am•e•terdaɪˈæm ɪ tər(n.)

  1. a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end. a straight line passing from side to side of any figure or body, through its center.

    Category: Math

  2. the length of such a line.

    Category: Math

  3. the width of a circular or cylindrical object.

    Category: Math

Origin of diameter:

1350–1400; ME diametre < OF < L diametros < Gk diámetros diagonal, diameter =dia-dia - +-metros, der. of métronmeter1


Princeton's WordNet

  1. diameter, diam(noun)

    the length of a straight line passing through the center of a circle and connecting two points on the circumference

  2. diameter(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)

Kernerman English Learner's Dictionary

  1. diameter(noun)ɪˈæm ɪ tər

    a straight line through the center of a circle, or its length


  1. diameter(Noun)

    Any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.

  2. diameter(Noun)

    The length of such a line.

  3. diameter(Noun)

    The maximum distance between any two points in a metric space

  4. diameter(Noun)

    The maximum eccentricity over all vertices in a graph.

Webster Dictionary

  1. Diameter(noun)

    any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve

  2. Diameter(noun)

    a diametral plane

  3. Diameter(noun)

    the length of a straight line through the center of an object from side to side; width; thickness; as, the diameter of a tree or rock

  4. Diameter(noun)

    the distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module


  1. Diameter

    In geometry, the diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. It can be also defined as the longest chord of the circle. Both definitions are also valid for the diameter of a sphere. The word "diameter" is derived from Greek διάμετρος, "diameter of a circle", from δια-, "across, through" + μέτρον, "measure". In more modern usage, the length of a diameter is also called the diameter. In this sense one speaks of the diameter rather than a diameter, because all diameters of a circle or sphere have the same length, this being twice the radius. For a convex shape in the plane, the diameter is defined to be the largest distance that can be formed between two opposite parallel lines tangent to its boundary, and the width is defined to be the smallest such distance. Both quantities can be calculated efficiently using rotating calipers. For a curve of constant width such as the Reuleaux triangle, the width and diameter are the same because all such pairs of parallel tangent lines have the same distance. See also Tangent lines to circles.

British National Corpus

  1. Nouns Frequency

    Rank popularity for the word 'diameter' in Nouns Frequency: #2461

Anagrams of diameter

  1. diatreme

Translations for diameter

Kernerman English Multilingual Dictionary


(the length of) a straight line drawn from side to side of a circle, passing through its centre

Could you measure the diameter of that circle?

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