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Affixes: the building blocks of English
Affixes: the building blocks of English
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-itious

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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