The Collaborative International Dictionary of English v.0.48:

Chaeronea \Chaeronea\ n. (Greek antiquity)
   either of two battles in ancient Greece, one in which Philip
   of Macedon defeated the Athenians and Thebans (338 BC), or
   another in which Sulla defeated Mithridates (86 BC).
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

Chaeronea
    n 1: a battle in which Philip II of Macedon defeated the
         Athenians and Thebans (338 BC) and also Sulla defeated
         Mithridates (86 BC)