radius

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ra|dius /r'eɪdiəs/ (radii /r'eɪdiaɪ/)
1 [N-SING] with supp
The radius around a particular point is the distance from it in any direction.
Nigel has searched for work in a ten-mile radius around his home.
2 [N-COUNT]
The radius of a circle is the distance from its centre to its outside edge.
He indicated a semicircle with a radius of about thirty miles.

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