A diameter is a line segment passing through the center of a circle or sphere with both its endpoints on the circle or sphere.
Diameter may also refer to:
- Diameter (graph theory), the longest distance between 2 points on a graph
- Diameter (protocol), a computer protocol
- Diameter (group theory), the measure of a finite group's complexity
- The diameters of a screwthread
- Diameter of a set, the supremum (i.e. "maximum") of the distances between any two points of a subset of a metric space
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