Main Entry:: ¹sig·nal
Pronunciation:: \ˈsig-n^əl\
Function:: noun
Etymology:: Middle English, from Medieval Latin signale, from Late Latin, neuter of signalis of a sign, from Latin signum
Date:: 14th century

1: sign , indication2 a: an act, event, or watchword that has been agreed on as the occasion of concerted action b: something that incites to action3: something (as a sound, gesture, or object) that conveys notice or warning4 a: an object used to transmit or convey information beyond the range of human voice b: the sound or image conveyed in telegraphy, telephony, radio, radar, or television c: a detectable physical quantity or impulse (as a voltage, current, or magnetic field strength) by which messages or information can be transmitted

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