WordReference Random House Learner's Dictionary of American English © 2017
in•ves•ti•gate /ɪnˈvɛstɪˌgeɪt/USA pronunciation   v.,  -gat•ed, -gat•ing. 
  1. to look into or examine the particulars of (something) carefully so as to discover something hidden, unique, or complex: [no object]The police were called in to investigate.[+ object]The scientists were investigating the behavior of dolphins.
in•ves•ti•ga•tor, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2017
in•ves•ti•gate  (in vesti gāt′),USA pronunciation v.,  -gat•ed, -gat•ing. 
  1. to examine, study, or inquire into systematically; search or examine into the particulars of;
    examine in detail.
  2. to search out and examine the particulars of in an attempt to learn the facts about something hidden, unique, or complex, esp. in an attempt to find a motive, cause, or culprit:The police are investigating the murder.

  1. to make inquiry, examination, or investigation.
in•vesti•ga′tive, in•ves•ti•ga•to•ry  (in vesti gə tôr′ē, -tōr′ē),USA pronunciation adj.  in•vesti•ga′tor, n. 
  • Latin investīgātus, past participle of investīgāre to follow a trail, search out. See in-2, vestige, -ate1
  • 1500–10

'investigator' also found in these entries:

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