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 something that converts energy into motion. It also can be used to apply a force. An actuator typically is a mechanical device that takes energy â usually energy that is created by air, electricity or liquid â and converts it into some kind of motion. That motion can be in virtually any form, such as blocking, clamping or ejecting.