1.having the leading position or higher score in a contest;
he is ahead by a pawn
2.at or in the front;
I see the lights of a town ahead
3.toward the future; forward in time;
I like to look ahead in imagination to what the future may bring
4.in a forward direction;
go ahead
5.ahead of time; in anticipation;
when you pay ahead (or in advance) you receive a discount
6.to a more advanced or advantageous position;
a young man sure to get ahead
7.to a different or a more advanced time (meaning advanced either toward the present or toward the future);
moved the appointment ahead from Tuesday to Monday
8.leading or ahead in a competition;
the horse was three lengths ahead going into the home stretch