alarm

IPA: ʌɫˈɑrm

A summons to arms, as on the approach of an enemy.
Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger.
A sudden attack; disturbance.
Sudden surprise with fear or terror excited by apprehension of danger; in the military use, commonly, sudden apprehension of being attacked by surprise.
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.

(transitive) To call to arms for defense.
(transitive) To give (someone) notice of approaching danger, or necessary action; to rouse to vigilance; to put on the alert.
(transitive) To surprise with apprehension of danger; to fill with anxiety in regard to threatening evil; to excite with sudden fear.
(transitive) To keep in excitement; to disturb.

Examples of "alarm" in Sentences

Most areas, only the Alarm security people arrive if the alarm is activated.
Surely adding to their alarm is the realization that the nuclear imbalance, troubling enough already, will only grow in the coming years.
As in a mirror Lady Russell's journal reflects what she calls the alarm in the Whig camp at the rumour of the intended resignation of the Derby
At one point, a magical 'alarm' is placed on the word 'Voldemort' (which is forbidden to be said), knowing that only Harry or his friends will say it.
It takes creativity and flexibility because you never know when the fire alarm is going to sound and put an end to the really great lesson you put together.
If the handset and locator become separated beyond a pre-defined distance -- the wireless halo referred to in the company name -- an alarm is sounded on both.
Therefore, understanding how your brain became so vigilant and wary, and so easily hijacked by alarm, is the first step toward gaining more control over that ancient circuitry.