What is the meaning of Glee?

Joy; happiness; great delight, especially from one's own good fortune or from another's misfortune.

Music; minstrelsy; entertainment.

An unaccompanied part song for three or more solo voices, not necessarily merry.

To sing a glee (unaccompanied part song).

something that is wet because it has been pasted together

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Source: wiktionary.org