Definition of subliminal in English:
 subliminal
adjective səˈblɪmɪn(ə)lˌsəbˈlɪmənl
Psychology (of a stimulus or mental process) below the threshold of sensation or consciousness; perceived by or affecting someone's mind without their being aware of it.
 Example sentencesExamples
-  Designed to work on a subliminal level, after the event it grows in the mind's eye rather than fading from memory.
 -  In lay terms, he is interested in how subliminal information can be conveyed.
 -  A number of these studies have used subliminal stimuli to produce the increase in positive affect.
 -  An audio subliminal message could be defined as a verbal stimulus perceived below the threshold of awareness.
 -  As is typical with this method, no participant reported being aware of the subliminal faces.
 
 Synonyms
subconscious, unconscious
hidden, concealed
Origin
  
Late 19th century: from sub- 'below' + Latin limen, limin- 'threshold' + -al.
   Definition of subliminal in US English:
 subliminal
adjectiveˌsəbˈlimənlˌsəbˈlɪmənl
Psychology (of a stimulus or mental process) below the threshold of sensation or consciousness; perceived by or affecting someone's mind without their being aware of it.
 Example sentencesExamples
-  An audio subliminal message could be defined as a verbal stimulus perceived below the threshold of awareness.
 -  In lay terms, he is interested in how subliminal information can be conveyed.
 -  A number of these studies have used subliminal stimuli to produce the increase in positive affect.
 -  As is typical with this method, no participant reported being aware of the subliminal faces.
 -  Designed to work on a subliminal level, after the event it grows in the mind's eye rather than fading from memory.
 
 Synonyms
subconscious, unconscious
Origin
  
Late 19th century: from sub- ‘below’ + Latin limen, limin- ‘threshold’ + -al.