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an·ces·tor (ănsĕstər)
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n.
1. A person from whom one is descended, especially if more remote than a grandparent; a forebear.
2. A forerunner or predecessor.
3. Law The person from whom an estate has been inherited.
4. Biology The actual or hypothetical organism or stock from which later kinds evolved.

[Middle English auncestre, from Old French, from Latin antecessor, predecessor, from antecessus, past participle of antecēdere, to precede : ante-, ante- + cēdere, to go; see ked- in the Appendix of Indo-European roots.]

Synonyms: ancestor, forebear, forefather, progenitor
These nouns denote a person from whom one is descended: a chart showing the genealogy of her ancestors; land once owned by his forebears; a cemetery where some of my forefathers are buried; descended from illustrious progenitors.
Antonym: descendant

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2016 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

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