detect

[dih-tekt]
verb (used with object)
1.
to discover or catch (a person) in the performance of some act: to detect someone cheating.
2.
to discover the existence of: to detect the odor of gas.
3.
to find out the true character or activity of: to detect a spy.
4.
Telecommunications.
a.
to rectify alternating signal currents in a radio receiver.
b.
to demodulate.

Origin:
1400–50; late Middle English < Latin dētēctus (past participle of dētegere), equivalent to dē- de- + teg(ere) to cover + -tus past participle suffix

detectable, detectible, adjective
detectability, detectibility, noun
predetect, verb (used with object)
undetectable, adjective
undetectably, adverb
undetected, adjective
undetectible, adjective


2. See learn.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
detect (dɪˈtɛkt)
 
vb
1.  to perceive or notice: to detect a note of sarcasm
2.  to discover the existence or presence of (esp something likely to elude observation): to detect alcohol in the blood
3.  to extract information from (an electromagnetic wave)
4.  obsolete to reveal or expose (a crime, criminal, etc)
 
[C15: from Latin dētectus uncovered, from dētegere to uncover, from de- + tegere to cover]
 
de'tectable
 
adj
 
de'tectible
 
adj
 
de'tecter
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

detect
mid-15c., from L. detectus, pp. of detegere "uncover, disclose," from de- "un-, off" + tegere "to cover" (see stegosaurus).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It wants someone to develop a sniffing machine that can detect individuals by
  their body odor.
Many images are of gels, which are ways to detect proteins or other molecules
  in a sample, and often they are blurry.
Jewel beetles detect fires using receptors called sensilla.
Actually, scientists are finding that the ability to detect sarcasm really is
  useful.
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