Dictionary may refer to any of the following:
1. A dictionary is an alphabetical listing of words and their meanings. Dictionaries help users look up definitions to better understand the word, language, or field. Many computers do not include an electronic dictionary; however, with access to the Internet, there are hundreds of free online dictionaries.
Dictionary v.s. thesaurus
A dictionary describes the meaning of a word. A thesaurus is used to group different words with the same meaning (synonyms) and similar words. For example, looking up the word "computer" in a dictionary would define the word like what is found in our computer definition. Looking up the word "computer" in a thesaurus gives you synonyms like PC, CPU (central processing unit), calculator, abacus, and laptop that could be used in place of the word computer.
Why would someone need a dictionary on a computer?
On a computer, a dictionary is used to check the user's spelling and sometimes to find word meanings, synonyms, and antonyms.
2. Dictionary can describe an associative array.