detective

[dih-tek-tiv]
noun
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
2.
of or pertaining to detection or detectives: a detective story.
3.
serving to detect; detecting: various detective devices.

Origin:
1830–40; detect + -ive

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
detective (dɪˈtɛktɪv)
 
n
1.  a.  a police officer who investigates crimes
 b.  See private detective
 c.  (as modifier): a detective story
 
adj
2.  used in or serving for detection
3.  serving to detect

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

detective
1850, short for detective police, from detective (adj.), 1843, from detect.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for detectives
It might be made a textbook for detectives to teach them what to avoid.
It starts with sabrina and daphne learning how to be detectives.
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