What does ahead mean?
The definition of ahead
A*head”, adv.
Etym: [Pref. a- + head.]

1 In or to the front; in advance; onward. The island bore but a little ahead of us. Fielding.
2 Headlong; without restraint. [Obs.] L’Estrange. To go ahead. (a) To go in advance. (b) To go on onward. (c) To push on in an enterprise. [Colloq] — To get ahead of. (a) To get in advance of.

(b) To surpass; to get the better of. [Colloq.]