#1 bagatelle n. a light piece of music for piano. wn
#2 bagatelle n. [fluff, frippery, frivolity] something of little value or significance. wn
#3 bagatelle n. [bar billiards] a table game in which short cues are used to knock balls into holes that are guarded by wooden pegs; penalties are incurred if the pegs are knocked over. wn
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