What is the meaning of Bagatelle?

A trifle; an insubstantial thing.

A short piece of literature or of instrumental music, typically light or playful in character.

A game similar to billiards played on an oblong table with pockets or arches at one end only.

Any of several smaller wooden tabletop games developed from the original bagatelle in which the pockets are made of pins.

To meander or move around, in a manner similar to the ball in the game of bagatelle.

To bagatellize; to regard as a bagatelle.

bagatelle, trinket, bauble

trifle

plural of bagatella

Source: wiktionary.org