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 ). Compare -ite2, -ous.

< Latin -icius or -īcius (as in adventitious); and < Latin -itiōsusor -ītiōsus (as in ambitious)

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World English Dictionary
suffix forming adjectives
having the nature of; characterized by: nutritious; suppositious
[from Latin -icius, -itious]

Collins English Dictionary - Complete & Unabridged 10th Edition
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