|a. the big time the highest or most profitable level of an occupation or profession, esp the entertainment business|
|b. (as modifier): a big-time comedian|
An enjoyable or exciting time, as in The children came home exhausted but happy; they really had a big time at the circus. [Mid-1800s]
The highest or most important level in any enterprise, as in I knew that when I made it through the last audition, I was finally in the big time. [Colloquial; c. 1900] Also see big league.