There are 2 definitions of -ty in English:

-ty1

suffix

Forming nouns denoting quality or condition such as beauty, royalty.

Origin

via Old French from Latin -tas, -tat-.

Definition of -ty in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something

There are 2 definitions of -ty in English:

-ty2

suffix

Denoting specified groups of ten: forty ninety

Origin

Old English -tig.

Definition of -ty in: