1. (v.t.)supersede to replace in power, authority, effectiveness, acceptance, use, etc., as by another person or thing.
2. supersede to set aside or cause to be set aside as void, useless, or obsolete, usu. in favor of something mentioned; make obsolete.
3. supersede to succeed to the position, function, office, etc., of; supplant.
Etymology: (1485–95; < L supersedēre to sit on top, refrain =super-super - +sedēre to sit)
Definition of 'supersede'
Princeton's WordNet
1. (verb)supplant, replace, supersede, supervene upon, supercede take the place or move into the position of "Smith replaced Miller as CEO after Miller left"; "the computer has supplanted the slide rule"; "Mary replaced Susan as the team's captain and the highest-ranked player in the school"
Definition of 'supersede'
Webster Dictionary
1. (verb)supersede to come, or be placed, in the room of; to replace
2. (verb)supersede to displace, or set aside, and put another in place of; as, to supersede an officer
3. (verb)supersede to make void, inefficacious, or useless, by superior power, or by coming in the place of; to set aside; to render unnecessary; to suspend; to stay
Definitions of supersede 
