Diameter meaning
Diameter is defined as the length of a straight line through the center of a circle.
An example of a diameter is the length of a line sliced down the center of a pie.
noun
The length of such a line segment.
A unit of magnification equal to the number of times an object's linear dimensions is increased by the magnifying apparatus.
noun
A line segment passing through the center of a circle, sphere, etc. from one side to the other.
noun
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A straight line segment that passes through the center of a circle or sphere from one side to the other.
The length of such a segment; width or thickness of a circular or spherical figure or object.
noun
The unit of measure of the magnifying power of a lens.
noun
An authentication, authorization and accounting (AAA) protocol that replaces RADIUS (Diameter is a play on the word RADIUS). Like RADIUS, Diameter uses a challenge/response method; however, unlike RADIUS, Diameter uses the reliable TCP and SCTP protocols rather than the unreliable UDP for transport. Diameter also supports error reporting and is better at scaling than RADIUS. See RADIUS, network access server and challenge/response.
(geometry) Any straight line between two points on the circumference of a circle that passes through the centre/center of the circle.
noun
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(geometry) The length of such a line.
noun
Thickness or width.
noun
Origin of diameter
 Middle English diametre from Old French from Latin diametrus from Greek diametros (grammē) diagonal (line) dia dia metron measure mē^{2} in IndoEuropean roots
From American Heritage Dictionary of the English Language, 5th Edition

From Wiktionary