-tudesuff. Condition, state, or quality: exactitude.[French, from Old French, from Latin -t?d?, -t?din-.]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.-tude suffix forming nouns indicating state or condition: plenitude. [from Latin -t?d?]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014-tude a suffix occurring primarily in loanwords from Latin or French, typically abstract nouns formed from adjectives: altitude; gratitude; exactitude. [(