luck in WordNet English dictionary

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"
   luck  fortune  chance  hazard 
   
2. 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"
   fortune  destiny  fate  luck  lot  circumstances  portion 
   
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"
   luck  fortune