What does supersede mean? supersede. Verb 1. (transitive) ; Set (something) ; aside. 2. (transitive) ; Take the place of. For example, No one could supersede his sister. 3. (transitive) ; Displace in favour of another. For example, Modern US culture has superseded the native forms. supersede. Noun 1. (Internet) ; An updated newsgroup post that supersedes an earlier version. For example, Rogue cancels and supersedes are being issued on a large scale against posters.