Plural of glee; multiple instances of joy and delight, or multiple songs sung by a glee club.
Regular plural of 'glee' from Old English 'glēo' meaning entertainment, mirth, and music. In later usage, 'glee' came to mean a type of secular vocal composition, and 'glees' refers to multiple such songs.
A 'glee' is technically a type of song performed without instruments—Glee clubs in universities are named after this old musical form! So when someone says they're in a Glee club, they're using a word that dates back to medieval entertainment traditions.
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