I've had a few clients recently who were confused about the AMCAS Work/Activity Experience Description character limits and how the Most Meaningful Experiences fit in.
Please remember that AMCAS Experience Descriptions can have up to 700 characters (not words!), while the Most Meaningful Experiences max out at 1325 characters. (Note, then, that the Most Meaningful Experiences are separate from the Experience Descriptions.)
Here's a short blog with AMCAS Work/Activity Experience Description writing tips and another with Most Meaningful Experiences guidance. Good luck!