Tonight; this evening — used as a noun or adverb to refer to the coming night.
今晩は友達と食事に行きます。
I'm going out to eat with friends tonight.
今晩の会議は中止になった。
Tonight's meeting has been canceled.
今晩、気温が下がるので暖かくしてください。
It will get colder tonight, so dress warmly.