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alarm (n.)

late 14c., "a call to arms in the face of danger or an enemy," from Old French alarme (14c.), from Italian all'arme "to arms!" (literally "to the arms"); a contraction of phrase alle arme. Alle is itself a contraction of a "to" (from Latin ad; see ad-) + le, from Latin illas, fem. accusative plural of ille "the" (see le); with arme, from Latin arma "weapons" (including armor), literally "tools, implements (of war)," from PIE root *ar- "to fit together."

The interjection came to be used as the word for the call or warning (compare alert). Extended 16c. to "any sound to warn of danger or to arouse," and to the device that gives it. From mid-15c. as "a state of fearful surprise;" weakened sense of "apprehension, unease" is from 1833. Variant alarum (mid-15c.) is due to the rolling -r- in the vocalized form. Sometimes in early years Englished as all-arm. Alarm clock is attested from 1690s (as A Larum clock).

alarm (v.)

1580s, "call to arms for defense," from alarm (n.) or from French alarmer (16c.), from the noun in French. Meaning "surprise with apprehension of danger" is from 1650s. Related: Alarmed; alarming.

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Definitions of alarm from WordNet
1
alarm (n.)
fear resulting from the awareness of danger;
Synonyms: dismay / consternation
alarm (n.)
a device that signals the occurrence of some undesirable event;
Synonyms: warning device / alarm system
alarm (n.)
an automatic signal (usually a sound) warning of danger;
Synonyms: alert / warning signal / alarum
alarm (n.)
a clock that wakes a sleeper at some preset time;
Synonyms: alarm clock
2
alarm (v.)
fill with apprehension or alarm; cause to be unpleasantly surprised;
Synonyms: dismay / appal / appall / horrify
alarm (v.)
warn or arouse to a sense of danger or call to a state of preparedness;
The empty house alarmed him
Synonyms: alert
From wordnet.princeton.edu