The free dictionary

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.

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.

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.