Terminology is a comprehensive reference tool for the English language. It combines a dictionary, a thesaurus, and an internet-enabled research tool. Terminology's dictionary/thesaurus feature is usable offline. It contains clear, simple definitions along with root words, synonyms, antonyms, more/less specific words, audio pronunciations, and more. Terminology supports wildcard searching, maintains search history, offers spelling suggestions, and allows users to add notes to any term. When used with a network connection, Terminology's definitions are enriched with cross references to online sources like Wikipedia, IMDb, Google, and others. Terminology is available for macOS and iOS. The iOS version adds a "Look Up" option to text in all others apps.