Definition of Upbeat

Babylon English Dictionary
optimistic, cheerful
(Music) unaccented beat that precedes an accented downbeat; upward movement of the hand made by a musical conductor to indicate an unaccented beat
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Upbeat Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

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)

WordNet 2.0

Noun
1. a contented state of being happy and healthy and prosperous; "the town was finally on the upbeat after our recent troubles"
(synonym) wellbeing, well-being, welfare, eudaemonia, eudaimonia
(hypernym) prosperity, successfulness
(hyponym) fool's paradise
2. an unaccented beat (especially the last beat of a measure)
(hypernym) rhythm, beat, musical rhythm

Adjective
1. pleasantly (even unrealistically) optimistic
(synonym) cheerful, pollyannaish
(similar) optimistic
Upbeat Definition from Entertainment & Music Dictionaries & Glossaries
Basic Music Glossary
a weak beat preceding the downbeat