tomorrow (the day after today); used as a noun or adverb. (あした/あす/みょうにち differ in register: あした is common, あす/みょうにち more formal.)
あした学校に行きます。
I'll go to school tomorrow.
あすの会議は午後3時からです。
Tomorrow's meeting starts at 3 p.m.
みょうにちの天気予報を見てください。
Please check tomorrow's weather forecast.
明日までに宿題を出してください。
Please submit your homework by tomorrow.
the near future; used to indicate something that may happen very soon (e.g., 'as early as tomorrow').
その決定は明日にも発表される可能性がある。
The decision may be announced as early as tomorrow.
明日を見据えて計画を立てる。
Make plans with an eye to the near future.
彼は明日にも来ると言っているが確かではない。
He says he might come as early as tomorrow, but it's not certain.