a suffix appearing in abstract nouns (generally formed from Latin adjectives or participles) of Latin origin ( latitude; altitude ); on this model, used in the formation of new nouns: platitude.
[ -tudo ( > F -tude ) ]
-TUDE
Meaning of -TUDE in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012