Meaning of INQUIRY in English

INQUIRY

noun

DUBIOUS : After making several inquiries I finally discovered his address.

GOOD : After making several enquiries, I finally discovered his address.

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In a simple request for information, the usual word is enquiry : 'We've had a lot of enquiries in response to the advertisement.'

When you mean 'a full investigation or a long serious study', the usual word is inquiry : 'a court of inquiry', 'There is to be an official inquiry into the cause of the crash.'

Longman Common Errors English vocabulary.      Английский словарь распространенных ошибок Longman.