Diameter - What does diameter mean?

Definition of DIAMETER:

A measurement used to indicate the size of a circle based on the length of a straight line that begins and ends at the edge of the circle and also passes through the centre of the circle. Diameter is represented by the symbol Ø and is commonly abbreviated to "dia" or "d". At Label Planet, we use diameter to indicate the size of our circular labels.

Here is the Harvard-style citation to use if you would like to reference this definition of the word diameter:
Label Planet (2020) What does diameter mean? | Diameter Definition. Available at: https://www.labelplanet.co.uk/glossary/diameter/ (Accessed: January 1, 2023).