-tude
suff. Condition, state, or quality: exactitude.
[French, from Old French, from Latin -tūdō, -tūdin-.]
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 -tūdō]
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.
[(< French) < Latin -tūdō]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.