The adj ahead has 1 sense (first 1 from tagged texts)
1. (1) ahead, in the lead, leading -- (having the leading position or higher score in a contest; "he is ahead by a pawn"; "the leading team in the pennant race")
Overview of adv ahead
The adv ahead has 7 senses (first 4 from tagged texts)
1. (21) ahead, in front, before -- (at or in the front; "I see the lights of a town ahead"; "the road ahead is foggy"; "staring straight ahead"; "we couldn't see over the heads of the people in front"; "with the cross of Jesus marching on before")
2. (5) ahead, forward -- (toward the future; forward in time; "I like to look ahead in imagination to what the future may bring"; "I look forward to seeing you")
3. (5) ahead, onward, onwards, forward, forwards, forrader -- (in a forward direction; "go ahead"; "the train moved ahead slowly"; "the boat lurched ahead"; "moved onward into the forest"; "they went slowly forward in the mud")
4. (1) ahead, in advance, beforehand -- (ahead of time; in anticipation; "when you pay ahead (or in advance) you receive a discount"; "We like to plan ahead"; "should have made reservations beforehand")
5. ahead -- (to a more advanced or advantageous position; "a young man sure to get ahead"; "pushing talented students ahead")
6. ahead -- (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"; "pushed the deadline ahead from Tuesday to Wednesday")
7. ahead, out front, in the lead -- (leading or ahead in a competition; "the horse was three lengths ahead going into the home stretch"; "ahead by two pawns"; "our candidate is in the lead in the polls"; "way out front in the race"; "the advertising campaign put them out front in sales")