A mechanical device for awaking people, or rousing their attention.
An instance of an alarm ringing, beeping or clanging, to give a noise signal at a certain time.
A sudden attack; disturbance.
Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger.
A summons to arms, as on the approach of an enemy.
Sudden surprise with fear or terror excited by apprehension of danger; in the military use, commonly, sudden apprehension of being attacked by surprise.
To give (someone) notice of approaching danger
To rouse to vigilance and action; to put on the alert.
To surprise with apprehension of danger; to fill with anxiety in regard to threatening evil; to excite with sudden fear.
To call to arms for defense
To keep in excitement; to disturb.
An installation of such a system or of the transmitting and receiving apparatus.
A method of detecting distant objects and determining their position, velocity, or other characteristics by analysis of sent radio waves (usually microwaves) reflected from their surfaces
A type of system using such a method, differentiated by platform, configuration, frequency, power, and other technical attributes.
A superior ability to detect something.
To scan with radar, or as if with radar.