-itysuff. State; quality: abnormality.[Middle English -itie, from Old French -ite, from Latin -it?s, variant of -t?s, -ty.]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.-ity suffix forming nouns indicating state or condition: technicality. [from Old French -ite, from Latin -it?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)