What does sui generis mean?
Sui generis
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Sui generis (/ˌsuːiˈdʒɛnərɪs/;[1] Latin:[ˈsʊ.iː ˈɡɛnɛrɪs]) is a Latin phrase that means "of its (his, her, their) own kind; in a class by itself; unique."[2]