ahead

At or towards the front; in the direction one is facing or moving.

The island was directly ahead.

Just ahead you can see the cliffs.

So as to be further advanced, either spatially or in an abstract sense; to be superior.

He finished two laps ahead of me.

In all of his classes Jack was ahead.

In or for the future.

There may be tough times ahead.

You've got to think ahead so as not to be unprepared.

To a later time.

Set the clock ahead an hour.

Push the deadline ahead a day, from the 20th to the 21st.

At an earlier time; beforehand; in advance.

He paid his rent ahead.