0 an object or machine that has been invented for a particular purpose: --
1 a method that is used to produce a particular effect: --
2 a bomb or other explosive: --
an explosive/incendiary/nuclear device
3 an object or machine that has been invented to fulfill a particular purpose: --
He invented a device for measuring very small distances exactly.
electronic/mechanical devices
a safety device
a handheld device
4 a method that is used to produce a desired effect: --
His temper tantrums were just a device for attracting attention.
5 an object or machine which has been invented for a particular purpose: --
A mouse is a device that makes it easier to select different options from computer menus.
We have a device that switches the lights on at a preset time in the evening.
It's an artificial device that stimulates the auditory areas of the brain.
The president's car is equipped with a homing device as a security measure.