radius
[noun]
Synonyms: range, ambit, compass, extension, extent, orbit, purview, reach, scope, sweep

[TahlilGaran] English Synonym Dictionary ▲

ra‧di‧us /ˈreɪdiəs/ noun (plural radii /-diaɪ/) [countable]
[Date: 1500-1600; Language: Latin; Origin: 'ray, radius']

1. the distance from the centre to the edge of a circle, or a line drawn from the centre to the edge ⇒ diameter

2. an area that covers a particular distance in all directions from a central point:
The shock of the explosion was felt over a radius of forty miles.
within a 10-mile/200-metre etc radius
There are more than a dozen golf courses within a 15-mile radius of St Andrews.

3. technical the outer bone of the lower part of your arm

[TahlilGaran] Dictionary of Contemporary English ▲