Meaning of “radius” in the English Dictionary

"radius" in British English

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radiusnoun [ C ]

uk /ˈreɪ.di.əs/ us /ˈreɪ.di.əs/ plural radii

(Definition of “radius” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"radius" in American English

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radiusnoun [ C ]

us /ˈreɪ·di·əs/ plural radii /ˈreɪ·diˌɑɪ/

geometry (the length of) a straight line from the center of a circle to its edge:

The supermarket, shopping mall, and school are all within a one-mile radius of the house (= are all less than a mile away from it).

(Definition of “radius” from the Cambridge Academic Content Dictionary © Cambridge University Press)