sui ge·ner·is /ˌsuˌaɪˈʤɛnərəs; ˌsuiˈʤɛ, ˈgɛ-/
Su·i gen·e·ris Of his or its own kind.
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sui generis
adj : constituting a class of its own; unique; "a history book sui
generis"; "sui generis works like Mary Chestnut's Civil
War diary"