A forebear, an ancestor, a predecessor.
By extension, a non-competitor who leads out the competitors on to the circuit, or who runs/rides the course prior to competitor trials, usually testing or checking the way.
A postage stamp used in the time before a region or area issues stamps of its own.
A runner at the front or ahead.
A precursor or harbinger, a warning ahead.
One who precedes; one who has preceded another in any state, position, office, etc.; one whom another follows or comes after, in any office or position.
A model or type of machinery or device which precedes the current (or later) one. Usually used to describe an earlier, outdated model.
A vertex having a directed path to another vertex