WordReference Random House Learner's Dictionary of American English © 2015
lex•i•con /ˈlɛksɪˌkɑn, -kən/USA pronunciation n. [countable],pl. -ca
    /-kə/USA pronunciation-cons.
    1. a list, wordbook, or dictionary of a language.
    2. Linguisticsthe vocabulary of a particular language, field, social class, person, etc.

Collins Concise English Dictionary © HarperCollins Publishers::

lexicon /ˈlɛksɪkən/ n
  1. a dictionary, esp one of an ancient language such as Greek or Hebrew
  2. a list of terms relating to a particular subject
  3. the vocabulary of a language or of an individual
  4. the set of all the morphemes of a language
Etymology: 17th Century: New Latin, from Greek lexikon, n use of lexikos relating to words, from Greek lexis word, from legein to speak

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