Etymology
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ancestor (n.)

"one from whom a person is descended," c. 1300, ancestre, antecessour, from Old French ancestre, ancessor "ancestor, forebear, forefather" (12c., Modern French ancêtre), from Late Latin antecessor "predecessor," literally "fore-goer," agent noun from past-participle stem of Latin antecedere "to precede," from ante "before" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + cedere "to go" (from PIE root *ked- "to go, yield"). The current form is from early 15c. Feminine form ancestress is recorded from 1570s.

updated on September 20, 2022

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Definitions of ancestor from WordNet

ancestor (n.)
someone from whom you are descended (but usually more remote than a grandparent);
Synonyms: ascendant / ascendent / antecedent / root
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.