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.

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

subliminally, adverb
nonsubliminal, adjective
nonsubliminally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subliminal (sʌbˈlɪmɪnəl)
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]

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

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)

  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
The ruling elite send subliminal messages to control you and are aliens.
Sophisticated retailers use a variety of subliminal clues to attract shoppers.
The subliminal story is the recognition of the lie by the error detection
Frontoparietal activation has also been found in studies of subliminal stimulus
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