part of a machine or a set of parts that does a particular job:
the brake mechanism
a clock mechanism
a system that is intended to achieve something or deal with a problem
mechanism for (doing) something
existing mechanisms for decision making
mechanism to do something➔ exchange rate mechanism
The Army has set up mechanisms to help jobless ex-soldiers get work.
a system or a way of behaving that helps a living thing to avoid or protect itself from something difficult or dangerous
When a person is ill, the body's natural defence mechanisms come into operation.
the way that something works
the mechanism of the brain