-ty

From Middle English -ty, from Old English -tiġ (“-ty”), from Proto-Germanic *tigiwiz, plural of *teguz (“group of ten”), from Proto-Indo-European *deḱ-, *déḱm̥ (“ten”). Cognate with Scots -ty (“-ty”), West Frisian -tich (“-ty”), Dutch -tig (“-ty”), German -zig (“-ty”), Gothic 𐍄𐌹𐌲𐌿𐍃 (tigus, “group of ten, decade”). Related to ten.

From Middle English -te, from Old French -te, from Latin -tās, -tātem.