Lexicon is Mixpanel's primary data management tool. It serves as both a data dictionary where you can define your events and properties, and as a “clean-up” tool to keep your Mixpanel instance organized and easy to use.
All users are able to view a project’s Lexicon, but only users with a project admin role or higher are able to edit the data descriptions, add labels, and use the clean-up tools. The Lexicon tool can be found by clicking into the Data Management tab in the Mixpanel top navigation bar.
Pro-Tip: Reference your Tracking Plan
If those responsible for implementing Mixpanel have been using our getting started resources, a tracking plan should be available for reference. This document should contain nearly all the information you will want to add to your projects Lexicon.