Provided is a method including obtaining a first text of a natural language text document displayed by the application, detecting a definitional statement in the first text, and parsing a defined term and a definition of the defined term from the definitional statement. The method also includes storing the defined term and the definition in an entry in a dictionary data structure and associating the entry with a location in the text document. The method also includes detecting the defined term being used in another location in the document and, in response, causing a visual indication to be presented in a first region in association with the defined term being used in the other location. The method may include causing the definitional statement or definition thereof to be displayed in a second region concurrently with displaying the defined term and the visual indication in the first region.