Wiktionary
a. One generation apart. alt. One generation apart.
Usage examples of "once removed".
Consequently they were second cousins once removed, according to the English mode of expression.
When once removed, they shall be forever incapable of being re-appointed to that house.
But you still haven't finished explaining this Jeff person, who is my uncle once removed, or my cousin, or both.
My parents would be my second cousins once removed and Chapter Eleven would be my third cousin as well as my brother.
Behind the southern redoubts of the Zenica Cage, General Vukalovic and his three senior officers, Colonel Janzy, Colonel Lazlo and Major Stephan, for once removed the glasses through which they had been so long peering at the Neretva bridge and the menacing woods beyond and smiled their incredulous relief at one another.