sui generis

adjective sui ge·ner·is \ˌsü-ˌī-ˈje-nə-rəs; ˌsü-ē-ˈje-, -ˈge-\

: in a class or group of its own : not like anything else

Full Definition of SUI GENERIS

: constituting a class alone : unique, peculiar

See sui generis defined for English-language learners

Latin, of its own kind

First Known Use: 1754

Synonyms: alone, lone, one, one-off, singular, sole, solitary, special, only, unique

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