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Meaning of big time

big' time'

Pronunciation: [key]
  1. the highest or most important level in any profession or occupation: She's a talented violinist, but she's not ready for the big time.
  2. a very good time.
  3. (in vaudeville) any highly successful circuit of theaters that produces two performances daily.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.