/ ˌbægəˈtel; NAmE / noun
1.
[ U ] a game played on a board with small balls that you try to hit into holes
2.
[ C , usually sing. ] ( literary ) a small and unimportant thing or amount :
It cost a mere bagatelle.
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WORD ORIGIN
mid 17th cent. (in sense 2): from French , from Italian bagatella , perhaps from baga baggage or from a diminutive of Latin baca berry. Sense 1 dates from the early 19th cent.