Definition of "Ahead" :
adjective: having the leading position or higher score in a contest
"He is ahead by a pawn."
adverb: at or in the front
"I see the lights of a town ahead."
adverb: ahead of time; in anticipation
"When you pay ahead (or in advance) you receive a discount."
adverb: in a forward direction
adverb: leading or ahead in a competition
"The horse was three lengths ahead going into the home stretch."
adverb: 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."
adverb: to a more advanced or advantageous position
"A young man sure to get ahead."
adverb: toward the future; forward in time
"I like to look ahead in imagination to what the future may bring."