Definition of: supersede

(s′pər·sēd·) v.t. ·sed·ed, ·sed·ing
1. To take the place of, as by reason of superior worth, right, or appropriateness; replace; supplant.
2. To put something in the place of; set aside; suspend; annul. See synonyms under SUBVERT. [<OF superceder <L supersedere sit over, forbear <super- above + sedere sit]
—su′per·sed′er noun
—su′per·se′·dure (-sē′jər), su′per·ses′sion (-sesh′ən) noun