(~s)
1.
A ~ of someone is a direct ancestor of theirs. (FORMAL)
He was also a ~ of seven presidents of Nicaragua.
N-COUNT: usu with poss
2.
The ~ of an idea or invention is the person who first thought of it. (FORMAL)
...Clive Sinclair, ~ of the C5 electric car.
= originator
N-COUNT: usu with poss