-tysuff. Condition; quality: realty.[Middle English -te, from Old French, from Latin -t?s.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.-ty suffix (Mathematics) denoting a multiple of ten: sixty; seventy. [from Old English -tig ten]-ty suffix forming nouns indicating state, condition, or quality: cruelty. [from Old French -te, -tet, from Latin -t?s, -t?t-; related to Greek -t?s]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014-ty1 , a suffix of numerals that are multiples of ten: twenty; thirty. [Middle English; Old English -tig, c. Old Frisian -tich, Old High German -zug, Old Norse tigr, Gothic tigjus; akin to ten] -ty2 , a suffix occurring in loanwords from Latin and French, forming mainly from adjectives nouns denoting state or condition: ability; certainty; chastity; unity. [Middle English -te(e)