-ty

-ty

1
a suffix of numerals denoting multiples of ten: twenty; thirty.

Origin:
Middle English; Old English -tig; cognate with Old Frisian -tich, German -zig, Old Norse -tigr, Gothic -tigjus

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-ty

2
a suffix occurring in nouns of Latin origin, denoting quality, state, etc.: unity; enmity.

Origin:
Middle English -te(e) < Old French -te(t) < Latin -tātem, accusative of -tās

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World English Dictionary
-ty1
 
suffix
denoting a multiple of ten: sixty; seventy
 
[from Old English -tigten]

-ty2
 
suffix forming nouns
indicating state, condition, or quality: cruelty
 
[from Old French -te, -tet, from Latin -tās, -tāt-; related to Greek -tēs]

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Word Origin & History

-ty
suffix representing "ten" in cardinal numbers (sixty, seventy, etc.), from O.E. -tig, from a Gmc. root (cf. Du. -tig, O.Fris. -tich, O.N. -tigr, O.H.G. -zig, -zug, Ger. -zig) that existed as a distinct word in Gothic tigjus, O.N. tigir "tens, decades." English, like many other Germanic languages, retains
traces of a base-12 number system. The most obvious instance is eleven and twelve which ought to be the first two numbers of the "teens" series. Their Old English forms, enleofan and twel(eo)f(an), are more transparent: "leave one" and "leave two." Old English also had hund endleofantig for "110" and hund twelftig for "120." One hundred was hund teantig. The -tig formation ran through 12 cycles, and could have bequeathed us numbers *eleventy ("110") and *twelfty ("120") had it endured, but already during the O.E. period it was being obscured. O.N. used hundrað for "120" and þusend for "1,200." Tvauhundrað was "240" and þriuhundrað was "360." Older Germanic legal texts distinguished a "common hundred" (100) from a "great hundred" (120). This duodecimal system, according to one authority, is "perhaps due to contact with Babylonia."

-ty
suffix used in forming abstract nouns from adjectives (safety, surety, etc.), M.E. -te, from O.Fr. -te, from L. -tatem (-tas, gen. -tatis), cognate with Gk. -tes, Skt. -tati-.
Online Etymology Dictionary, © 2010 Douglas Harper
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