noun

investigation

investigation, inquiry, examination

The investigation is still ongoing.

The investigation is still ongoing.

He is under investigation for fraud.

He is under investigation for fraud.

an investigation ((into sth.)) an official examination of the facts about a situation They launched an investigation into the accident.

under investigation being officially examined The company is under investigation.

Synonyms: inquiry, probe, examination

From the verb 'investigate' plus the suffix '-ion', which forms nouns denoting an action or process.

An 'investigation' is the act or process of investigating.

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