supersede

UK: /ˌsuːpə^rˈsiːd/ US: /ˌsupɚˈsid/ ,(so̅o̅′pər sēd′)

Inflections of 'supersede' (v): (⇒ conjugate)

supersedes

v 3rd person singular

superseding

v pres p

superseded

v past

superseded

v past p

WordReference Random House Learner's Dictionary of American English © 2026

su•per•sede /ˌsupɚˈsid/   v. [~ + object] , -sed•ed, -sed•ing. 

1. to take the place of (another), as by having more power, authority, effectiveness, etc.:
   This new drug will supersede all others.
2. to set (something, as a regulation) aside as being no longer in force:
   This new regulation concerning import fees supersedes the old one.

WordReference Random House Unabridged Dictionary of American English © 2026

su•per•sede  (so̅o̅′pər sēd′), v.t., -sed•ed, -sed•ing. 

1. to replace in power, authority, effectiveness, acceptance, use, etc., as by another person or thing.
2. to set aside or cause to be set aside as void, useless, or obsolete, usually in favor of something mentioned;
   make obsolete:
   They superseded the old statute with a new one.
3. to succeed to the position, function, office, etc., of;
   supplant.

• Latin supersedēre to sit above or upon, forbear, equivalent. to super- super- + sedēre to sit¹
• 1485–95

su′per•sed′a•ble, adj. 
su′per•sed′er, n. 
Synonyms

• 1. See replace. 
• 2. void, overrule, annul, revoke, rescind.

Collins Concise English Dictionary © HarperCollins Publishers::

supersede / ˌsuːpəˈsiːd/ verb (transitive)

1. to take the place of (something old-fashioned or less appropriate); supplant
2. to replace in function, office, etc; succeed
3. to discard or set aside or cause to be set aside as obsolete or inferior

Etymology: 15th Century: via Old French from Latin supersedēre to sit above, from super- + sedēre to sit

ˌsuperˈsedence noun

supersedure / ˌsuːpəˈsiːdʒə/ noun

supersession / ˌsuːpəˈsɛʃən/ noun