Ahead \A*head"\, adv. [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.]

Source: Webster's Revised Unabridged Dictionary (1913)