Pitch

From EFlightWiki

Pitch refers to the angle of the blades on a helicopter or propeller. The angle of attack of the blade is determined by the pitch and the speed air is flowing through the propellor/rotor.

The angle of attack of an airofoil determines the lift and drag produced. Thus the pitch of a propellor/rotor blade affects the torque required to drive it at a certain speed, as well as the thrust produced at a given speed.

Propeller Pitch

When applied to propellers, pitch indicates the distance a propeller would move through a static medium per revolution.

Helicopter Pitch

Pitch can be applied to the main rotor of a CP heli as well as the tail rotor of a belt or shaft-driven tail. It is usually measured in degrees.