I. to ‧ night 1 S1 W2 /təˈnaɪt/ BrE AmE adverb
[ Language: Old English ; Origin: to niht , from to 'to, at' + niht 'night' ]
during the night of this day:
I think I’ll go to bed early tonight.
We’re meeting him at 9 o'clock tonight.
II. tonight 2 BrE AmE noun [uncountable]
the night of this day:
I’m really looking forward to tonight.
Tonight should be fun.
Here is tonight’s news bulletin.