WordReference Random House Learner's Dictionary of American English © 2017
in•ves•ti•ga•tion /ɪnˌvɛstɪˈgeɪʃən/USA pronunciation   n. 
  1. the act or process of investigating or the condition of being investigated: [uncountable]a matter for investigation.[countable]police investigations.

WordReference Random House Unabridged Dictionary of American English © 2017
in•ves•ti•ga•tion  (in ves′ti gāshən),USA pronunciation n. 
  1. the act or process of investigating or the condition of being investigated.
  2. a searching inquiry for ascertaining facts;
    detailed or careful examination.
in•ves′ti•gation•al, adj. 
  • Latin investīgātiōn- (stem of investīgātiō). See investigate, -ion
  • late Middle English investigacio(u)n 1400–50
    • 1, 2.See corresponding entry in Unabridged scrutiny, exploration.
      Investigation, examination, inquiry, research express the idea of an active effort to find out something. An
      investigation is a systematic, minute, and thorough attempt to learn the facts about something complex or hidden;
      it is often formal and official:an investigation of a bank failure.An
      examination is an orderly attempt to obtain information about or to make a test of something, often something presented for observation:a physical examination.An
      inquiry is an investigation made by asking questions rather than by inspection, or by study of available evidence:an inquiry into a proposed bond issue.Research is careful and sustained investigation.

Collins Concise English Dictionary © HarperCollins Publishers::

investigation /ɪnˌvɛstɪˈɡeɪʃən/ n
  1. the act or process of investigating; a careful search or examination in order to discover facts, etc

'investigations' also found in these entries:

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