(rarities)
1.
If someone or something is a ~, they are interesting or valuable because they are so unusual. (JOURNALISM)
Sontag has always been that ~, a glamorous intellectual...
N-COUNT: usu sing, oft N in/among n
2.
The ~ of something is the fact that it is very uncommon.
It was a real prize due to its ~ and good condition...
N-UNCOUNT: oft with poss