sui generis

Definition

In a class of its own; one of a kind.

Etymology

Borrowed from Latin suī generis (literally “of its own kind/class”).

Example Sentences

• "It is easy to describe second-rate talents, because they fall into a class and enlist under a standard; but first-rate powers defy calculation or comparison, and can be defined only by themselves. They are sui generis, and make the class to which they belong."
• "The transcendent case before us is absolutely sui generis."
• "The eminent Italian geologist, Stoppani, goes further than I had ventured to do, and treats the action of man as a new physical element altogether sui generis."