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Forming adjectives.

Either from nouns ending in ‑ition, or from Latin ‑itius, alteration of Latin ‑icius.

Examples from nouns in ‑ition arise by losing the last two letters and adding the suffix ‑ous; they include ambitious, nutritious, repetitious, and seditious. Examples from the Latin ending ‑itius include adventitious (happening or carried on according to chance), fictitious, and suppositious (based on assumption rather than fact).

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