/ ˈdɪkʃənri; NAmE -neri/ noun ( pl. -ies )
1.
a book that gives a list of the words of a language in alphabetical order and explains what they mean, or gives a word for them in a foreign language :
a Spanish-English dictionary
2.
a book that explains the words that are used in a particular subject :
a dictionary of mathematics
3.
a list of words in electronic form, for example stored in a computer's spellchecker
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WORD ORIGIN
early 16th cent.: from medieval Latin dictionarium (manuale) or dictionarius (liber) manual or book of words, from Latin dictio , from dicere to say.