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1(geometry) one half of a circle
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- 2the line that forms the edge of a semicircle
- 3a thing, or a group of people or things, shaped like a semicircle a semicircle of chairs We sat in a semicircle round the fire.
NAmE//ˌsɛmiˈsərkyələr//
adjective a semicircular drivewaySee semicircle in the Oxford Advanced Learner's DictionaryCheck pronunciation: semicircle