su·per·ses·sion \ˌsüpə(r)ˈseshən\noun (-s) Etymology: Medieval Latin supersession-, supersessio, from Latin supersessus (past participle of supersedēre to supersede) + -ion-, -io -ion : the state of being superseded : removal and replacement : supersedure < the supersession of national imperialism by a genuinely international government — J.A.Hobson >