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

Dictionary.com Unabridged
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
You're a detective at a crime scene with no visible evidence.
Even guessing at its scope requires economic detective work.
While the label may still apply, pioneering dental detective work has revealed
  unexpected news about the species' dietary variety.
Each lesson will be devoted to an observation culled from among the many
  exploits of the great detective.
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