tonight
n. uncountablen. the evening or night of the day that is happening right now. You use it to talk about your plans for the hours after the sun goes down today.
n. the evening or night of the current day. Often functions as an adverbial noun to indicate the time of an action.
I am going to a concert tonight.
We should stay home tonight because a heavy storm is expected to arrive after dinner.
The clear sky tonight offers a rare opportunity for amateur astronomers to observe the alignment of the planets without the interference of clouds.
From Middle English tonyght, to niȝt, from Old English tō niht.
Commonly functions as an adverb of time without a preposition; when used as a noun, it can be the subject or object of a sentence.
I will see you in tonightI will see you tonightTonight acts as an adverbial noun and does not require a preposition like 'in' or 'at' to indicate time.