Define — Double-Click Dictionary & Vocab Builder

Define turns any word on the page into an instant definition — just double-click. See the meaning, pronunciation (IPA), and an example sentence without leaving what you're reading. Building your vocabulary? Save words with one click and review them later with built-in spaced repetition. Power users can bring their own LLM key for richer, in-context explanations. WHAT IT DOES • Double-click any word for an instant definition, IPA, and example • Save words to a personal list to study later • Spaced-repetition review to actually remember them • Optional: bring your own LLM key for deeper explanations PRIVATE BY DESIGN • Definitions and saved words stay local in your browser • No account required, no tracking • Any optional LLM key you add is stored locally and used only for your requests HOW TO USE 1. Double-click a word on any page 2. Read the definition, IPA, and example in the popup 3. Save it to review later with spaced repetition