Open Dictionary
mouse here to listen, click to choose/add more
Location: USA
Source: Learn That Word
Profile URL:

Are you a native English speaker? How do you pronounce this word?

Thank you for contributing!
upload mp3 file or record now it's easy, promised!

{%type%} Definitions

WordNet 3.0Copyright Princeton University


Short "hint"

the act or process of investigating or the condition of being investigated; searching inquiry for ascertaining facts; detailed or careful examination

Usage examples (34)
  • Long-term investigational trials indicate that consistent use of the cannabis-based medicine may also slow the progression of the disease.
  • Charles River's reputation is world-renowned for their conduct of studies using radiolabelled investigational products.
  • Merrell gave the drug to more than 1,000 U.S. physicians to distribute to 20,000 patients as part of an "investigational" trial.
  • The drug company gave 1.200 American doctors 2.5 million tablets on an "investigational" basis. for more
Tutoring comment

Tutoring comment not yet available...

add more
The Open Dictionary of English is a collaborative project, based on Open Source materials, LearnThat resources, and partner APIs.
We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google,,, and YouTube,,,,, as well as the generous Creative Commons community.