It is a common spelling error.
People often make this mistake because they associate the word with other verbs ending in "-cede", such as "precede", "recede", and "concede". This leads to the assumption that "supersede" follows the same spelling pattern. However, "supersede" is derived from the Latin word "supersedēre", where "sedēre" means "to sit", not "to go" as in "cedere". Therefore, the correct spelling uses "sede" rather than "cede".
"Supersede" is the correct spelling. It means to replace something older or obsolete, or to take the place of something else in power, authority, or importance.
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