From WordNet (r) 3.0 (2006):
firing
n 1: the act of firing weapons or artillery at an enemy; "hold
your fire until you can see the whites of their eyes";
"they retreated in the face of withering enemy fire" [syn:
fire, firing]
2: the act of discharging a gun [syn: discharge, firing,
firing off]
3: the act of setting something on fire [syn: ignition,
firing, lighting, kindling, inflammation]
4: the termination of someone's employment (leaving them free to
depart) [syn: dismissal, dismission, discharge,
firing, liberation, release, sack, sacking]