Rarity
Nouns
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rarity, tenuity
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absence of solidity etc. Density
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subtility
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subtilty, subtlety
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sponginess, compressibility. rarefaction, expansion, dilatation, inflation, subtilization. vaporization, evaporation, diffusion, gassification. ether etc. (gas) Gaseity.
Verbs
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rarefy, expand, dilate, subtilize.
Adjectives
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rare, subtile, thin, fine, tenuous, compressible, flimsy, slight
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light etc. Levity
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cavernous, spongy etc. (hollow) Concavity. rarefied etc. v.
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unsubstantial
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uncompact, incompressed
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rarefiable.