SUPERSEDE - from Latin supersedere literally "sit on top of;" also, with ablative, "stay clear of, abstain from, forbear, refrain from," from super "above" (see super-) + sedere "to sit" (see sedentary). Meaning "displace, replace" first recorded 1640s
for the person who asked about "precede" (or recede, etc.) - it's a completely different rood:
cede (v.) Look up cede at Dictionary.com
1630s, from French céder or directly from Latin cedere "to yield, give place; to give up some right or property," originally "to go from, proceed, leave," from Proto-Italic *kesd-o- "to go away, avoid," from PIE root *sed- (2) "to go, yield" (cognates: Sanskrit sedhati "to drive; chase away;" Avestan apa-had- "turn aside, step aside;" Greek hodos "way," hodites "wanderer, wayfarer;" Old Church Slavonic chodu "a walking, going," choditi "to go"). Related: Ceded; ceding. The sense evolution in Latin is via the notion of "to go away, withdraw, give ground."
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