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