U.S. Justice Department: Does Neighborhood Watch reduce crime? Neighborhood Watch programs became popular in the 1970s and 1980s; by 2000, roughly 40% of the U.S. residential population was covered by such citizen crime-watching programs.
Definition of actuarial. 1  1 : of or relating to actuaries. 2  2 : relating to statistical calculation especially of life expectancy.
An actuator is a component of a machine that is responsible for moving or controlling a mechanism or system. An actuator requires a control signal and a source of energy. The control signal is relatively low energy and may be electric voltage or current, pneumatic or hydraulic pressure, or even human power. The supplied main energy source may be electric current, hydraulic fluid pressure, or pneumatic pressure.