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I am looking for a term that means ultimate parent, in the context of the last in a line of parent-of parent-of parent-of a subject. An example sentence this word or phrase would be used:

Abraham begot Isaac, Isaac begot Jacob, Jacob begot Judah and so on, but the _____________ of all of them is Adam.

I could make something up like ultimate ancestor or root ancestor, borrowing the latter term from OS filesystem nomenclature, but I'd prefer a word that already exists for this purpose.

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I'd say the word your looking for is primogenitor, or possibly progenitor, which are seen as synonyms by Oxford Dictionary:

From https://en.oxforddictionaries.com/definition/primogenitor

primogenitor NOUN

An ancestor, especially the earliest ancestor of a people; a progenitor.

progenitor NOUN

1A person or thing from which a person, animal, or plant is descended or originates; an ancestor or parent. ‘his children were the progenitors of many of Scotland's noble families’

I like primogenitor better, because it is rooted in the root primo-, meaning "first."

  • +1. The prefix pro- also means first, as well as "before, in front of". – Dan Bron Nov 6 '17 at 18:46
  • @DanBron Yes, but as you said, it can mean other things as well. That's why I favor primo-. – Steven Littman Nov 6 '17 at 18:49

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