What is another word for "rarity"?

Roget's Thesaurus (1911) lists these synonyms for "rarity": absence, all, almost, and, any, between, blue, cavernous, compressibility, compressible, cull, decimate, decimation, diamond, diffusion, dilatation, dilate, diminish, eliminate, elimination, eradication, ether, evaporation, ever, exiguity, exiguous, expand, expansion, experience, far, few, fewness, fine, flimsy, for, gas, handful, hardly, has, here.