What does diameter mean?

Definitions for diameterdaɪˈæm ɪ tər

Here are all the possible meanings and translations of the word diameter.

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)


  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

  5. Origin: [F. diamtre, L. diametros, fr. Gr. ; dia` through + measure. See Meter.]


  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.

Chambers 20th Century Dictionary

  1. Diameter

    dī-am′e-tėr, n. the measure through or across: a straight line passing through the centre of a circle or other figure, terminated at both ends by the circumference.—adjs. Diam′etral, Diamet′ric, -al, in the direction of a diameter: pertaining to the diameter: like the opposite ends of the diameter (as in diametrical opposition).—advs. Diam′etrally, in a diametral manner; Diamet′rically, exactly.—Tactical diameter, the space covered by a steamer in turning 180° out of her original course. [Through Fr. and L. from Gr. diametrosdia, through, metrein, to measure.]

British National Corpus

  1. Nouns Frequency

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


  1. Chaldean Numerology

    The numerical value of diameter in Chaldean Numerology is: 8

  2. Pythagorean Numerology

    The numerical value of diameter in Pythagorean Numerology is: 3

Sample Sentences & Example Usage

  1. Alex Walsh:

    Organoids are small pieces of a patients' tumor that are about 100 to 300 microns in diameter and they grow as kind of sphere like shapes.

  2. Jim Jobling:

    It fires a shell that is about 3 inches in diameter, it could have been used as case shot, or shrapnel, on ongoing soldiers or sailors in rowboats.

  3. Kevin Ling:

    As I got closer, the flames were just bigger and bigger, it was shooting up to 200 feet or more, and a fireball maybe 10 to 15 feet in diameter. It was like out of a movie.

  4. Le Cun:

    There is an eight-foot buoy floating at the point of the intake piping, which has been in place since the plant opened, and states that people should stay 100 feet away. There are three intake pipes, which extend for a quarter mile along the floor of the ocean, and the one that the diver swam into is 16 feet in diameter with a protective cap.

Images & Illustrations of diameter

Translations for diameter

From our Multilingual Translation Dictionary

Get even more translations for diameter »


Find a translation for the diameter definition in other languages:

Select another language:

Discuss these diameter definitions with the community:

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:     


Use the citation below to add this definition to your bibliography:


"diameter." Definitions.net. STANDS4 LLC, 2017. Web. 26 Apr. 2017. <http://www.definitions.net/definition/diameter>.

Are we missing a good definition for diameter? Don't keep it to yourself...

Nearby & related entries:

Alternative searches for diameter:

Thanks for your vote! We truly appreciate your support.