A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
You can look up the definition or meaning of a word in OneNote by using the Smart Lookup tool or the Immersive Reader feature.
In the OneNote desktop app, right-click the word you want to check and select Smart Lookup. You can also go to the Review tab on the ribbon and select Smart Lookup. This opens a definition and research pane.
In OneNote for the web and supported versions, you can go to the View tab and select Immersive Reader. Immersive Reader provides built-in definition tools, including a picture dictionary. More at https://support.microsoft.com/en-us/education/learning-accelerators/define-words-using-immersive-reader-picture-dictionary
Alternatively, you can right-click a word and select Search or Look Up, depending on your operating system and OneNote version.
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hth
Marcin