I'm personally impartial to linking or not linking, but I can see giving brief definitions in the actual document for reasons of knowing what we signed, when we signed it.
And, for the lowest-priority opinion ever, I stopped spelling "Mary Sue" with a hyphen at some point because I noticed it's spelled without one in the original Star Trek parody, so I'd change it if it were up to me. Only mentioning it so I can stop wondering to myself whether I should or not. (There, brain, I did it. Nobody's gonna care. Leave me alone now.)