say it: soo-pur-SEED
supersede is a verb meaning "take the place or move into the position of". It carries one recorded sense.
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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for supersede come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.