1. A reference work with a list of words from one or more languages, normally ordered alphabetically, explaining each word's meaning, and sometimes containing information on its etymology, pronunciation, usage, translations, and other data.
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wordbook
2. (preceded by the) A synchronic dictionary of a standardised language held to only contain words that are properly part of the language.
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3. (by extension) Any work that has a list of material organized alphabetically; e.g., biographical dictionary, encyclopedic dictionary.
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4. An associative array, a data structure where each value is referenced by a particular key, analogous to words and definitions in a physical dictionary.