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Synonyms

detective

American  
[dih-tek-tiv] / dɪˈtɛk tɪv /

noun

detectives plural
  1. a member of the police force or a private investigator whose function is to obtain information and evidence, as of offenses against the law.


adjective

  1. of or relating to detection or detectives.

    a detective story.

  2. serving to detect; detecting.

    various detective devices.

detective British  
/ dɪˈtɛktɪv /

noun

    1. a police officer who investigates crimes

    2. See private detective

    3. ( as modifier )

      a detective story

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adjective

  1. used in or serving for detection

  2. serving to detect

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Noun Inflected Forms

Etymology

Origin of detective

First recorded in 1830–40; detect + -ive

Explanation

Whether it's a police detective who investigates crimes or a private detective hired to find a missing person, a detective is someone whose job is to find out hard-to-get information. Detective comes from the Latin root detectus meaning to uncover or expose. Detectives detect, or discern and uncover the truth, the way a dog might detect an odor and uncover a bone. Sherlock Holmes, perhaps the most famous detective in fiction, used disguises, deductive reasoning and forensics to solve crimes. "When you have eliminated the impossible, whatever remains, however improbable, must be the truth," he famously said.

Keep Reading on Vocabulary.com

Vocabulary lists containing detective

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.

See Examples For:

"My mum was like, 'ooh, you've got a detective coming to speak to you, you're in a lot of trouble'," Lucas said.

From BBC Jul. 31, 2026

The detective said Berk was correct both times.

From Los Angeles Times Jul. 27, 2026

"I think that explains a lot about where I ended up. I do feel like a detective."

From Science Daily Jul. 16, 2026

Most writers of detective stories trick us by withholding or muddling the one clue that explains everything; Chesterton is so fun that you won’t even care.

From The Wall Street Journal Jul. 14, 2026

Jonah was getting annoyed with their little junior detective routine.

From "Found" by Margaret Peterson Haddix

By the time Blake went on trial, nearly a decade had passed since Simpson’s acquittal for double homicide, but for prosecutors and detectives, the humiliation was fresh.

From Los Angeles Times Jul. 30, 2026

Essex Police has urged any witnesses to come forward as its detectives piece together what happened.

From BBC Jul. 24, 2026

DC Studios will also grace Hall H to preview its HBO series "Lanterns," starring Kyle Chandler and Aaron Pierre as small-town Nebraska detectives, which debuts August 16.

From Barron's Jul. 23, 2026

Anti-corruption detectives started working on Greer, and obtained his mobile phone number, which had previously not been held on his personnel file.

From BBC Jul. 23, 2026

Despite all this, the private detectives somehow failed to secure enough evidence to prosecute any of the suspects, or perhaps the private eyes were bought off.

From "Killers of the Flower Moon" by David Grann

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