Definitions for "Rarity"
An infrequently encountered or available item - The number of known surviving specimens of a particular issue, as may be indicated by a rarity scale index
generally relates to the infrequency or relative unavailability of a coin, as a direct function of important factors such as the original mintage and overall survival rate.
The number of specimens extant of any particular numismatic item. This can be the total number of extant specimens or the number of examples in a particular grade and higher. (This is referred to as condition rarity.)
The quality or state of being rare; rareness; thinness; as, the rarity (contrasted with the density) of gases.
That which is rare; an uncommon thing; a thing valued for its scarcity.
A book which an active dealer might expect to see only once in a lifetime. more rare than "scarce."
Keywords:  unusual, ort, worthy, valuable, thing
something unusual -- perhaps worthy of collecting
a person or thing that is interesting ort valuable because it is so unusual
a rarified quality; "the tenuity of the upper atmosphere"
Keywords:  ghost, town, indian, origin
a ghost town of Indian origin
see Prevalence (of abundance) and Intensity of abundance.