The inch per second is a unit of speed or velocity.
It expresses the distance in inches (in) traveled or displaced, divided by time in seconds (s, or sec).
The equivalent SI unit is the metre per second.
In computer mice sensitivity is also often referred to in inches per second (abbreviated as "ips") along with g force.
In rotorcraft health monitoring, rotor and shaft induced vibration levels are often quoted in inches per second.