At or towards the front; in the direction one is facing or moving.
The island was directly ahead.
So as to be further advanced, either spatially or in an abstract sense; to be superior.
He finished two laps ahead of me.
In or for the future.
There may be tough times ahead.
From a- + head. Perhaps originally a nautical term, "beyond the head (of a ship)", then drifting into more general English usage where it is used to describe something as being "in front of".
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