Definition: lexical

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Source: WordNet (r) 1.7 

lexical
     adj 1: of or relating to words; "lexical decision task"
     2: of or relating to dictionaries

Source: Webster's Revised Unabridged Dictionary (1913) 

Lexical \Lex"ic*al\ (-[i^]*kal), a.
   Of or pertaining to a lexicon, to lexicography, or words;
   according or conforming to a lexicon. -- Lex"ic*al*ly, adv.