A reference book or online resource containing an alphabetical list of words, with information about their meanings, pronunciations, etymologies, and usage.

She consulted the dictionary to find the correct spelling of the word.

A collection of data or information organized for easy access and retrieval, often used in computing.

The software uses a dictionary to store user preferences and settings.

The set of words known or used by a particular person, group, or field; vocabulary.

A preschooler's dictionary expands dramatically during the first years of schooling.

dictionaryadjective

Relating to or characteristic of a dictionary, especially one that lists words and their meanings.

The dictionary definition of the slang term was surprisingly formal.