Lewis Short
quăternĭo (noun M) : quaterni
* The number four, a quaternion, Mart. Cap. 7, § 767.— Esp.
* On dice, a quatre (postclass.), Isid. 18, 65.
* A body of four soldiers, a quaternion, Vulg. Act. 12, 4.
Charlton T. Lewis, Charles Short, A Latin Dictionary