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Latin word -tas comes from Proto-Indo-European *-iteh₂, and later Proto-Indo-European *-teh₂ts (Used to form nouns representing state of being.)
*-iteh₂ (Proto-Indo-European)
*-teh₂ts (Proto-Indo-European)
Used to form nouns representing state of being.
-tas (Latin)
-ty, -dom, -hood, -ness, -ship; Used to form nouns indicating a state of being.