sunshine
n. uncountable A1 Beginner US //ˈsənˌʃaɪn// UK //sˈʌnʃaɪn// sun·shine
n. the direct light and heat that comes from the sun. You can also use it as a friendly or slightly sarcastic name for someone.
n. the direct light and warmth emitted by the sun. When used as a form of address, it functions as a term of endearment or, frequently, as a patronising or sarcastic nickname.
The cat is sleeping in the sunshine.
After a week of heavy rain, the children were happy to finally play outside in the sunshine.
The morning sunshine filtered through the dusty curtains, illuminating the quiet room and revealing the slow dance of particles in the air.
Usage
Uncountable when referring to light; as a form of address, it is used without an article.