Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to investigation: investigative methods.
  • adj. Characterized by or engaged in investigation; specializing in uncovering and reporting hidden information: investigative journalism.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Of or pertaining to investigation; inquisitive; curious; searching.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Given to investigation; inquisitive; curious; searching.

from The Century Dictionary and Cyclopedia

  • Of or pertaining to investigation; given to investigation; curious and deliberate in research.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. designed to find information or ascertain facts

Etymologies

investigate +‎ -ive (Wiktionary)

Examples

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