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The Collaborative International Dictionary of English v.0.48 (gcide)

Dictionary \Dic"tion*a*ry\, n.; pl. {Dictionaries}. [Cf. F.
dictionnaire. See {Diction}.]
1. A book containing the words of a language, arranged
alphabetically, with explanations of their meanings; a
lexicon; a vocabulary; a wordbook.
[1913 Webster]

I applied myself to the perusal of our writers; and
noting whatever might be of use to ascertain or
illustrate any word or phrase, accumulated in time
the materials of a dictionary. --Johnson.
[1913 Webster]

2. Hence, a book containing the words belonging to any system
or province of knowledge, arranged alphabetically; as, a
dictionary of medicine or of botany; a biographical
dictionary.
[1913 Webster]