Meaning of “sun” - Learner’s Dictionary

sun

noun us uk /sʌn/
Extra Examples
The sun was shining brightly through the window.The sun vanished behind the trees.The sun was reflected on the surface of the water.Gradually the mist cleared and the sun began to shine.After a few minutes the sun came out.
the sun

A1 the large, bright star that shines in the sky during the day and provides light and heat for the Earth:

The sun rises in the East and sets in the West.

A1 [ U, no plural ] the light and heat that comes from the sun:

I can't sit in the sun for too long.

(Definition of “sun noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)