WordReference Random House Learner's Dictionary of American English © 2014
up•beat /ˈʌpˌbit/USA pronunciation n. [countable] Music and Dancean unaccented beat in music. Music and Dancethe upward stroke with which a conductor indicates such a beat.
adj.  optimistic;
cheerful:an upbeat report on the economy.

Collins Concise English Dictionary © HarperCollins Publishers::

upbeat /ˈʌpˌbiːt/ n
  1. a usually unaccented beat, esp the last in a bar
  2. the upward gesture of a conductor's baton indicating this
  1. informal marked by cheerfulness or optimism

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