Noun
1. an unknown and unpredictable phenomenon that causes an event to result one way rather than another;
"bad luck caused his downfall""we ran into each other by pure chance"2. a large amount of wealth or prosperity
3. an unknown and unpredictable phenomenon that leads to a favorable outcome;
"it was my good luck to be there""they say luck is a lady""it was as if fortune guided his hand"4. your overall circumstances or condition in life (including everything that happens to you);
"whatever my fortune may be""deserved a better fate""has a happy lot""the luck of the Irish""a victim of circumstances""success that was her portion"