Definitions

1. noun

the length of a straight line passing through the centre of a circle and connecting two opposite points on the circumference.

“The diameter of the Earth is approximately 12,742 kilometers.”

2. noun

the distance between two opposite points on the circumference of a circle, sphere, or cylinder.

“The diameter of the bicycle wheel is 26 inches.”

3. noun

the diameter of a pipe or tube, especially as a measure of its capacity.

“The diameter of the water pipe is 4 inches.”

4. noun

a characteristic or dimension of something, such as size or extent.

“The diameter of the company’s influence is vast.”

5. verb

to measure or calculate the diameter of something.

“The engineer had to diameter the pipe to ensure it was the correct size.”