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The free dictionary
Look up any word or term for free, and define concepts inline from any learning section.
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Open Dictionary and enter any word to see its definitions, parts of speech, and examples, sourced from Wiktionary under its CC BY-SA licence. No account or key is required.
Define inline
Highlighted concepts across summaries, study notes, and Ask answers open a small popover where you can read the definition, jump to its evidence, or explore it as its own topic — without leaving the page.
Search from anywhere
Press ⌘K (or the header search) to open the Novus Hub, then type a word to define it, or a topic to open it — one bar across topics, your library, and the dictionary.