Etymology
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ahead (adv.)

1620s, "at the head, in front," from a- "on" (see a- (1)) + head (n.) "front." Originally nautical (opposed to astern). Meaning "forward, onward" (the sense in go ahead) is from 1640s. To be ahead of (one's) time attested by 1837.

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Definitions of ahead
1
ahead (adv.)
at or in the front;
staring straight ahead
the road ahead is foggy
I see the lights of a town ahead
Synonyms: in front / before
ahead (adv.)
toward the future; forward in time;
I like to look ahead in imagination to what the future may bring
Synonyms: forward
ahead (adv.)
in a forward direction;
go ahead
the boat lurched ahead
the train moved ahead slowly
Synonyms: onward / onwards / forward / forwards / forrader
ahead (adv.)
ahead of time; in anticipation;
when you pay ahead (or in advance) you receive a discount
We like to plan ahead
Synonyms: in advance / beforehand
ahead (adv.)
to a more advanced or advantageous position;
a young man sure to get ahead
pushing talented students ahead
ahead (adv.)
to a different or a more advanced time (meaning advanced either toward the present or toward the future);
pushed the deadline ahead from Tuesday to Wednesday
moved the appointment ahead from Tuesday to Monday
ahead (adv.)
leading or ahead in a competition;
the horse was three lengths ahead going into the home stretch
ahead by two pawns
Synonyms: out front / in the lead
2
ahead (adj.)
having the leading position or higher score in a contest;
he is ahead by a pawn
Synonyms: in the lead / leading
From wordnet.princeton.edu