Definitionen
1.NounA measure of the scarcity of an object.
2.NounThinness; the property of having low density
3.NounA rare object.
4.Noun↑ Jespersen, Otto (1909), A Modern English Grammar on Historical Principles (Sammlung germanischer Elementar- und Handbücher; 9), volume I: Sounds and Spellings, London: George Allen & Unwin, published 1961, § 4.71, page 140.
5.Noun↑ “rarity”, in OneLook Dictionary Search.