Longman Dictionary of Contemporary English homepage

Language: Old French
Origin: Latin -io

-ion

 suffix
     
-ion [in nouns]
the act, state, or result of doing something:
the completion of the task (=act of finishing it)
his election (=he was elected) to the post
Young children demand a lot of attention.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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