(adv)
at or in the front; "I see the lights of a town ahead"; "the roadahead 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"
in a forward direction; "go ahead"; "the trainmovedahead slowly"; "the boat lurched ahead"; "moved onward into the forest"; "they went slowlyforward in the mud"
ahead of time; in anticipation; "when you pay ahead (or in advance) you receive a discount"; "We like to plan ahead"; "should havemade reservations beforehand"