rarity

ohuus

harvinaisuus A measure of the scarcity of an object.
puhekieltä Thinness; the property of having low density
(quote-book)|author=(w)|year=1927|passage=Only the increasing rarity bothered him, and he thought that perhaps it was this which had turned the heads of other travellers and excited those absurd tales of night-gaunts whereby they explained the loss of such climbers as fell from these perilous paths.
(senseid)A rare object.
{{quote-magazine|year=2013|month=May-June|author=http://www.americanscientist.org/authors/detail/david-van-tassel David Van Tassel, http://www.americanscientist.org/authors/detail/lee-dehaan Lee DeHaan