investigate
Americanverb (used with object)
-
to examine, study, or inquire into systematically; search or examine into the particulars of; examine in detail.
-
to search out and examine the particulars of in an attempt to learn the facts about something hidden, unique, or complex, especially in an attempt to find a motive, cause, or culprit.
The police are investigating the murder.
verb (used without object)
verb
Other Word Forms
- investigable adjective
- investigative adjective
- investigator noun
- investigatory adjective
- preinvestigate verb
- preinvestigator noun
- quasi-investigated adjective
- reinvestigate verb
- uninvestigated adjective
- uninvestigating adjective
- uninvestigative adjective
- uninvestigatory adjective
- well-investigated adjective
Etymology
Origin of investigate
First recorded in 1500–10; from Latin investīgātus, past participle of investīgāre “to follow a trail, search out”; see in- 2, vestige, -ate 1
Explanation
To investigate is to look into something systematically. If you don't understand how tornadoes work, for example, investigate the forces of wind and find out. Investigate still acts a lot like the word it comes from, investigationem meaning "a searching into," which came from the Latin for "to track a footprint." It's exactly what you do when you investigate. You can investigate in the name of science, which is to look into something systematically, like when you research how tornadoes work. If you investigate a person, you find out everything you can — and you might need to hire a private eye for help.
Vocabulary lists containing investigate
Jim Burke's Academic Vocabulary List
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List 8
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Word Generation Science - Preparing a Scientific Investigation
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
A Youth Custody Service spokesperson said the Prisons and Probation Ombudsman would investigate the death.
From BBC • Apr. 23, 2026
The league defended its media-rights dealings as federal regulators investigate the migration to streaming.
From The Wall Street Journal • Apr. 23, 2026
"It was in our Danish material that we first detected a signal. That gave us a concrete hypothesis, which we were then able to investigate in larger datasets," says Flemming Damgaard.
From Science Daily • Apr. 22, 2026
After these meetings, Trump directed Zeldin to investigate the insurers’ responses.
From Los Angeles Times • Apr. 22, 2026
"You think that the Clue Crew should investigate how Buttons is getting out of the petting zoo. And find out if Stacy has anything to do with it."
From "Pony Problems: Nancy Drew and the Clue Crew, #3" by Carolyn Keene
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
