# Definitions for diameterdaɪˈæm ɪ tərdi·am·e·ter

### Princeton's WordNet(1.80 / 5 votes)Rate this definition:

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)

### Wiktionary(2.00 / 1 vote)Rate this definition:

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(3.50 / 2 votes)Rate this definition:

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

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

2. Diameter(noun)

a diametral plane

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

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

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

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

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

### Freebase(5.00 / 2 votes)Rate this definition:

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(5.00 / 1 vote)Rate this definition:

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.]

### Dictionary of Nautical Terms(0.00 / 0 votes)Rate this definition:

1. diameter

In geometry, a right line passing through the centre of any circular figure from one point of its circumference to another.

### Military Dictionary and Gazetteer(0.00 / 0 votes)Rate this definition:

1. diameter

In both a military and geometrical sense, implies a right line passing through the centre of a circle, and terminated at each end by the circumference thereof.

### British National Corpus

1. Nouns Frequency

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

1. diatreme

1. Alex
US English
Daniel
British
Karen
Australian
Veena
Indian

### Numerology

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

### Examples of diameter in a Sentence

1. 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.

2. The penile artery that delivers the blood flow to the penis is a much smaller diameter, and it's the smaller blood vessels which show the first signs of disease, they are unable to dilate and deliver sufficient blood flow.

3. On the evening of closest approach on Dec( ember) 21 they will look like a double planet, separated by only 1/5th the diameter of the full Moon, for most telescope viewers, each planet and several of their largest moons will be visible in the same field of view that evening.

4. 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.

5. 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.

### Popularity rank by frequency of use

diameter#1#5388#10000

## Translations for diameter

### From our Multilingual Translation Dictionary

• قطر
• ব্যাস
• diàmetre
• průměr
• diamedr
• diameter
• Durchmesser
• διάμετρος
• diámetro
• قطر
• läpimitta, halkaisija
• diamètre
• lárlíne, trastomhas
• קוטר
• व्यास
• dyamèt
• átmérő
• տրամագիծ
• diametro
• 直径
• ವ್ಯಾಸ
• 직경
• line
• дијаметар, пречник
• diameter, garis pusat
• diameter
• diameter, doorsnede, middellijn
• diameter
• średnica
• diâmetro
• diametru
• диаметр, поперечник
• prečnik
• diameter
• kipenyo
• đường kính

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