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.
Electrical, hydraulic, or pneumatic device (such as a relay) that controls the flow of material or power. Also called actuation device. Use 'actuator' in a Sentence. I liked to study machines and today I had a look at an interesting thing called an actuator, which I had never heard of.