Definition: upbeat

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Source: WordNet (r) 1.7 

upbeat
     adj : pleasantly (even unrealistically) optimistic [syn: cheerful,
            pollyannaish]
     n 1: a contented state of being happy and healthy and prosperous;
          "the town was finally on the upbeat after our recent
          troubles" [syn: wellbeing, well-being, welfare, eudaemonia,
           eudaimonia] [ant: ill-being]
     2: an unaccented beat (especially the last beat of a measure)