(transitive) To turn the electrical power on to a device as a precondition to making it operational. / (intransitive) To become ready for operation as a result of the provision of electrical power.

simple past tense and past participle of power up

present participle of power up

At full power; at the very utmost limit. / For vessels that depends on engines for propulsion that is independent of assistance from any sails.

Using steam power.

(statistics) The probability that a statistical test will reject a false null hypothesis, that is, that it will not make a type II error, producing a false negative.

plural of power law

(Britain, slang) A tablet of the drug ecstasy.

(international relations) A state that has the ability to exert its influence on a global scale.

(automotive) A system for reducing the driver's effort to steer, by using a power source to assist in turning the wheels.