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radian [radians]▼(unit)noun[UK: ˈreɪ.diən] [US: ˈreɪ.diən]
radiant▼(the apparent origin of a meteor shower)noun[UK: ˈreɪ.dɪənt] [US: ˈreɪ.diənt]
steradian▼(derived unit of solid angle)noun
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