The word for today is…
sui generis (adjective):
: constituting a class alone : unique, peculiar
Source : Merriam -Webster
Etymology : Many English words ultimately trace back to the Latin forms gener- or genus (which are variously translated as “birth,” “race,” “kind,” and “class”). Offspring of those roots include general, generate, generous, generic, and gender. But sui generis is truly a one-of-a-kind genus descendant that English speakers have used to describe singular things since the late 1600s. Its earliest uses were in scientific contexts, but where it once mostly characterized substances, principles, diseases, and even rocks thought to be the only representative of their class or group, its use expanded by the early 1900s, and it is now used more generally for anything that stands alone.
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