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English definition of “sun”

sun

noun [S or U]     /sʌn/
A1 the star that the Earth moves around, which provides light and heat for the Earth, or the light or heat that the Earth receives from this star: The sun rises in the east and sets in the west. The sun's rays are at their most powerful at midday. I think I've had a bit too much sun today - I've got a headache. Let's go and sit out in the sun. We thought we'd go out for a walk while the sun was shining.LightStars and constellations
(Definition of sun noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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