Webster's English Dictionary

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subliminal

sub.li.mi.nal \(.)s*b-'lim-*n-*l, 's*b-, -'li--m*n-\ \-e-\ aj [sub- + L 
   limin-, limen threshold] 1: inadequate to produce a sensation or a 
   perception  2: existing or functioning outside the area of conscious 
   awareness {the  ~ mind} {~ techniques in advertising} - sub.li.mi.nal.ly av