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1. Fear resulting from the awareness of danger
   - dismay, consternation
    
2. A device that signals the occurrence of some undesirable event
   - warning device, alarm system
    
3. An automatic signal (usually a sound) warning of danger
   - alert, warning signal, alarum
    
4. A clock that wakes a sleeper at some preset time
   - alarm clock

1. Fill with apprehension or alarm; cause to be unpleasantly surprised
   "I was alarmed at the thought of being late for my interview"
   - dismay, appal [Brit, Cdn], appall [US], horrify
    
2. Warn or arouse to a sense of danger or call to a state of preparedness
   "The empty house alarmed him"
   - alert

Derived forms: alarming, alarms, alarmed

See also: alarming, alarmist, unalarming

Type of: affright, clock, device, fear, fearfulness, fright, frighten, scare, sign, signal, signaling [US], signalling, warn

Encyclopedia: Alarm