lucklucklucksluckedluckingnoun (no plural)1good things that happen to you that you cannot control: We wish you luck in your new career.2things that happen to you that you cannot control; chance: to have good luckbad luck, hard luckwords that you say to somebody when you are sorry that they did not have good luckbe in luckto have good things happen to you: I was in luck – the shop had the book I wanted.good luckwords that you say to somebody when you hope that they will do well: Good luck! I'm sure you'll get the job.