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Both -tion and -sion are used to form nouns from root Latin words. For example, mansus is Latin for house. By adding -sion, the word becomes mansion. In contrast, -tion is used to form a noun of action or condition, as in the root word complete, which means 'fill up' in Latin. Adding -tion makes the word completion, which is the act of finishing something.

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11y ago

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