unique

The safety of mass-produced food has improved dramatically in recent decades, but listeria, a common type of bacterium, presents unique hurdles.

These cavities in the earth trap time, preserving unique, delicate ecosystems for centuries.

The Parasaurolophus is a duck-billed dinosaur with a unique crest that lived 70 million to 80 million years ago.

Importantly, this improvement was unique to those who actually fell asleep -- the macaques that experienced quiet wakefulness without falling asleep did not show the same performance boost.

One of the things that is unique about your comedy is that it’s not about trying to say something necessarily outlandish.