The quality or state of being rare; infrequency of occurrence.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "rarity" in a sentence
"In short, it's only value lies in its rarity -- and such rarity is only attractive at times when dollars are anything but."
"Silver is beautiful, useful, valuable and growing in rarity and demand."
"They use the word rarity to describe this strain early in the outbreak."