Meaning of -TY in English

-TY

1.

suffix forming nouns denoting quality or condition (cruelty; plenty).

Etymology: ME -tie, -tee, -te f. OF -t{eacute}, -tet f. L -tas -tatis: cf. -ITY 2.

suffix denoting tens (twenty; thirty; ninety).

Etymology: OE -tig

Oxford English vocab.      Оксфордский английский словарь.