Etymology
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sui generis

1787, Latin, literally "of one's own kind, peculiar." First element from sui, genitive of suus "his, her, its, one's," from Old Latin sovos, from PIE root *swe-, pronoun of the third person (see idiom).

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Definitions of sui generis

sui generis (adj.)
constituting a class of its own; unique;
sui generis works like Mary Chestnut's Civil War diary
a history book sui generis
From wordnet.princeton.edu