iA Markdown Dictionary is a utility designed specifically for macOS, aimed at enhancing the user experience when working with Markdown. This free dictionary file integrates seamlessly with the native macOS Dictionary app, allowing users to perform instant lookups for Markdown syntax, examples, and formatting rules. It is particularly beneficial for those using iA Writer, iA Presenter, or any other text field on macOS, enabling them to learn and recall Markdown formatting quickly.

The dictionary covers essential Markdown elements such as headings, bold text, and lists, along with additional enhancements. Users can easily install it by unzipping the file and moving the 'iA Markdown.dictionary' file to the macOS Dictionary folder. Once enabled in the Dictionary app settings, users can select any Markdown character in their text applications and utilize the macOS lookup shortcut to instantly view its function, with examples provided for clarity.