Frequency: The word is one of the 1500 most common words in English.
Tonight is used to refer to the evening of today or the night that follows today.
I’m at home ~...
Tonight, I think he proved to everybody what a great player he was...
There they will stay until 11 o’clock ~.
ADV: ADV with cl, n ADV
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Tonight is also a noun.
...~’s flight to London.
N-UNCOUNT