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[dik-shuh-ner-ee] /ˈdɪk ʃəˌnɛr i/
noun, plural dictionaries.
1.
a book, optical disc, mobile device, or online lexical resource (such as Dictionary.com) containing a selection of the words of a language, giving information about their meanings, pronunciations, etymologies, inflected forms, derived forms, etc., expressed in either the same or another language; lexicon; glossary. Print dictionaries of various sizes, ranging from small pocket dictionaries to multivolume books, usually sort entries alphabetically, as do typical CD or DVD dictionary applications, allowing one to browse through the terms in sequence. All electronic dictionaries, whether online or installed on a device, can provide immediate, direct access to a search term, its meanings, and ancillary information:
an unabridged dictionary of English; a Japanese-English dictionary.
2.
a book giving information on particular subjects or on a particular class of words, names, or facts, usually arranged alphabetically:
a biographical dictionary; a dictionary of mathematics.
3.
Computers.
  1. a list of codes, terms, keys, etc., and their meanings, used by a computer program or system.
  2. a list of words used by a word-processing program as the standard against which to check the spelling of text entered.
Origin
1520-1530
1520-30; < Medieval Latin dictiōnārium, dictiōnārius < Late Latin dictiōn- word (see diction) + -ārium, -ārius -ary
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for diction aries

dictionary

/ˈdɪkʃənərɪ; -ʃənrɪ/
noun (pl) -aries
1.
  1. a reference resource, in printed or electronic form, that consists of an alphabetical list of words with their meanings and parts of speech, and often a guide to accepted pronunciation and syllabification, irregular inflections of words, derived words of different parts of speech, and etymologies
  2. a similar reference work giving equivalent words in two or more languages. Such dictionaries often consist of two or more parts, in each of which the alphabetical list is given in a different language: a German-English dictionary
  3. (as modifier): a dictionary definition See also glossary, lexicon, thesaurus
2.
a reference publication listing words or terms of a particular subject or activity, giving information about their meanings and other attributes: a dictionary of gardening
3.
a collection of information or examples with the entries alphabetically arranged: a dictionary of quotations
Word Origin
C16: from Medieval Latin dictiōnārium collection of words, from Late Latin dictiō word; see diction
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for diction aries

dictionary

n.

1520s, from Medieval Latin dictionarium "collection of words and phrases," from Latin dictionarius "of words," from dictio "word" (see diction). Probably first English use in title of a book was in Sir Thomas Elyot's "Latin Dictionary" (1538) though Latin Dictionarius was so used from early 13c. Grose's 1788 "Dictionary of the Vulgar Tongue" has "RICHARD SNARY. A dictionary."

Online Etymology Dictionary, © 2010 Douglas Harper
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Word Value for diction

10
12
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