WordReference Random House Unabridged Dictionary of American English © 2026
-itious,
- a compound suffix occurring in adjectives of Latin origin (adventitious) and with adjectives, formed in Latin or English, associated with nouns ending in -ition (ambitious;
expeditious). Cf. -ite2, -ous.
- Latin -itiōsus or -ītiōsus (as in ambitious)
- Latin -icius or -īcius (as in adventitious); and
'-itious' also found in these entries (note: many are not synonyms or translations):
adscititious
- adventitious
- artifactitious
- cementitious
- excrementitious
- expeditious
- factitious
- fictitious
- lateritious
- novice
- portcullis
- postiche
- sausage
- supposititious
- surreptitious