Meanings of lineal ancestor in English

This must be our excuse for a word or two concerning the race from which came his twenty-fifth lineal ancestor.

"A lineal ancestor, I'll bet a biscuit," chimed in "Hay."

The earliest lineal ancestors to today's Core personalities were not projects to create artificial intelligence, but incidental efforts to simulate artificial life.

Having driven out the former inhabitants of that part of the island called England, they became aborigines as to you, and your lineal ancestors.