rarity /rārˈ or rarˈi-ti/ noun

1. The state of being rare
2. Thinness
3. Something valued for its scarcity
4. Uncommonness

rare bird noun

An exceptional person or thing

rareˈbit noun

(often called Welsh rarebit) melted cheese, with or without ale, on hot toast (also rabbit or Welsh rabbit)

rare earth noun

1. An oxide of a rare-earth element, any of a group of metallic elements (some of them rare) closely similar in chemical properties and very difficult to separate
2. Now more usu a rare-earth element itself

rare gas noun

Inert gas

rare groove noun

A genre of music that mixes 1970s soul and funk with sampling and electronically generated sounds