- to discover or catch (a person) in the performance of some act: to detect someone cheating.
- to discover the existence of: to detect the odor of gas.
- to find out the true character or activity of: to detect a spy.
- to rectify alternating signal currents in a radio receiver.
- to demodulate.
Origin of detect
1400–50; late Middle English < Latin dētēctus (past participle of dētegere), equivalent to dē- de- + teg(ere) to cover + -tus past participle suffix
2. See learn.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for undetectable
It is a transformation that is undetectable to anyone not paying close attention.Cornel West’s Disappointing Decline
October 23, 2014
Viral load can be reduced to undetectable levels, but it never goes away.
And if we are going to have to live with our past and current racism, then we must strive for undetectable levels of infection.
For example, the Army wants an undetectable aiming laser for small arms.Special Ops’ Weapons Wish List
April 9, 2014
When the Undetectable Firearms Act passed in 1988, gun manufacturers had begun using lightweight polymer in handguns.The Deadly Plastic Gun Loophole the House Extension Leaves in Place
December 4, 2013
He'd broken through the screen of guard-ships in undetectable overdrive.Pariah Planet
They would be undetectable by normal telepathic means, you know.Indirection
Everett B. Cole
It is undetectable and invisible--your detectors do not touch it and light-waves are bent around it without loss or distortion.Triplanetary
Edward Elmer Smith
Monday morning Tom buckled down seriously to the job of designing an undetectable sub.
Those enemies of ours are clever, but if they can produce an undetectable sub, there's no reason why I can't do the same.
- to perceive or noticeto detect a note of sarcasm
- to discover the existence or presence of (esp something likely to elude observation)to detect alcohol in the blood
- to extract information from (an electromagnetic wave)
- obsolete to reveal or expose (a crime, criminal, etc)
C15: from Latin dētectus uncovered, from dētegere to uncover, from de- + tegere to cover
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
Word Origin and History for undetectable
Online Etymology Dictionary, © 2010 Douglas Harper