A revival series, a later remake of a pre-existing show, is "not" a spin-off (e.g. The "Battlestar Galactica" series of 2003 is a revival, not a spin-off of the 1978 version).
A revival series, a later remake of a pre-existing show, is "not" a spin-off. Neither is a reboot series, a term recently invented for motion pictures, which can also occur in television (e.g. The "Battlestar Galactica" series of 2003 is a reboot, not a spin-off of the 1978 version).