investigation is on the Academic Word List.

Pronunciation change

  • IPA (key): /ɪnˌvɛstəˈgeɪʃən/
  • (file)

Noun change

Singular
investigation

Plural
investigations

  1. (countable & uncountable) An investigation is a careful look at a crime, problem, etc. to find the truth or a solution.
    Researchers were conducting further investigations into the connection between smoking and lung disease.
    The cause of the fire is currently under investigation.

Related words change