sub·lim·i·nal

[suhb-lim-uh-nl]
adjective Psychology.
existing or operating below the threshold of consciousness; being or employing stimuli insufficiently intense to produce a discrete sensation but often being or designed to be intense enough to influence the mental processes or the behavior of the individual: a subliminal stimulus; subliminal advertising.

Origin:
1885–90; sub- + Latin līmin- (stem of līmen) threshold + -al1

sub·lim·i·nal·ly, adverb
non·sub·lim·i·nal, adjective
non·sub·lim·i·nal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Subliminal is an SAT word you need to know.
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without any name acknowledged, as that of author, contributor, or the like:
indifference, lack of concern, composure
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World English Dictionary
subliminal (sʌbˈlɪmɪnəl) [Click for IPA pronunciation guide]
 
adj
1.  resulting from processes of which the individual is not aware
2.  (of stimuli) less than the minimum intensity or duration required to elicit a response
 
[C19: from Latin sub- below + līmen threshold]
 
sub'liminally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

subliminal
1886, "below the threshold" (of consciousness), formed from sub "below" + L. limen (gen. liminis) "threshold." Apparently a loan-translation of Ger. unter der Schwelle (des Bewusstseins) "beneath the threshold (of consciousness)," from Johann Friedrich Herbart (1776-1841), author of a textbook on psychology
published in 1824. The scare over subliminal advertising came in 1957.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

subliminal sub·lim·i·nal (sŭb-lĭm'ə-nəl)
adj.

  1. Below the threshold of conscious perception. Used of stimuli.

  2. Inadequate to produce conscious awareness but able to evoke a response.


sub·lim'i·nal·ly adv.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And the subliminal message is that everything tastes better soaked in fat,
  animal fat.
Frontoparietal activation has also been found in studies of subliminal stimulus
  processing.
Participants meeting the study criteria will be randomized to the perceived
  stimulation or subliminal stimulation group.
Their work has allied itself with the discreet, almost subliminal beauty that
  radiates from the objects themselves.
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