| signal | | |
| n. (communication) | 1. sign, signal, signaling | any nonverbal action or gesture that encodes a message.; "signals from the boat suddenly stopped" |
| ~ communication | something that is communicated by or to or between people or groups. |
| ~ recording | a signal that encodes something (e.g., picture or sound) that has been recorded. |
| ~ phone number, telephone number, number | the number is used in calling a particular telephone.; "he has an unlisted number" |
| ~ starting signal, start | a signal to begin (as in a race).; "the starting signal was a green light"; "the runners awaited the start" |
| ~ storm signal | a signal announcing the approach of a storm (particularly a storm of marked violence). |
| ~ beam, radio beam | a signal transmitted along a narrow path; guides airplane pilots in darkness or bad weather. |
| ~ ticktack | system of signalling by hand signs used by bookmakers at racetracks. |
| ~ time signal | a signal (especially electronic or by radio) indicating the precisely correct time. |
| ~ dog-ear | a corner of a page turned down to mark your place. |
| ~ animal communication | communication between animals (of the same species). |
| ~ alarum, warning signal, alarm, alert | an automatic signal (usually a sound) warning of danger. |
| ~ distress call, distress signal | an internationally recognized signal sent out by a ship or plane indicating that help is needed. |
| ~ all clear | a signal (usually a siren) that danger is over. |
| ~ bugle call | a signal broadcast by the sound of a bugle. |
| ~ curfew | a signal (usually a bell) announcing the start of curfew restrictions. |
| ~ retreat | (military) a signal to begin a withdrawal from a dangerous position. |
| ~ drumbeat | (military) the beating of a drum as a signal for lowering the flag at sundown. |
| ~ radiotelegraphic signal, telegraphic signal | a signal transmitted by telegraphy. |
| ~ whistle, whistling | the act of signalling (e.g., summoning) by whistling or blowing a whistle.; "the whistle signalled the end of the game" |
| ~ high sign | a silent signal of warning or recognition.; "she started to speak but he gave her the high sign" |
| ~ symbol | an arbitrary sign (written or printed) that has acquired a conventional significance. |
| ~ visual signal | a signal that involves visual communication. |
| ~ indicator | a signal for attracting attention. |
| ~ electronic signal | a signal generated by electronic means. |
| ~ radio beacon | a characteristic signal emitted by a transmitter used for navigation. |
| ~ input, input signal | signal going into an electronic system. |
| ~ output signal, output | signal that comes out of an electronic system. |
| n. (motive) | 2. signal | any incitement to action.; "he awaited the signal to start"; "the victory was a signal for wild celebration" |
| ~ incitation, provocation, incitement | something that incites or provokes; a means of arousing or stirring to action. |
| n. (phenomenon) | 3. signal | an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes. |
| ~ interrupt | a signal that temporarily stops the execution of a program so that another procedure can be carried out. |
| ~ electrical energy, electricity | energy made available by the flow of electric charge through a conductor.; "they built a car that runs on electricity" |
| v. (communication) | 4. sign, signal, signalise, signalize | communicate silently and non-verbally by signals or signs.; "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu" |
| ~ communicate, intercommunicate | transmit thoughts or feelings.; "He communicated his anxieties to the psychiatrist" |
| ~ wigwag | signal by or as if by a flag or light waved according to a code. |
| ~ semaphore | send signals by or as if by semaphore. |
| ~ heliograph | signal by means of a mirror and the using the sun's rays. |
| ~ flag | communicate or signal with a flag. |
| ~ whistle | give a signal by whistling.; "She whistled for her maid" |
| v. (communication) | 5. bespeak, betoken, indicate, point, signal | be a signal for or a symptom of.; "These symptoms indicate a serious illness"; "Her behavior points to a severe neurosis"; "The economic indicators signal that the euro is undervalued" |
| ~ augur, auspicate, bode, foreshadow, omen, portend, presage, betoken, predict, prefigure, prognosticate, forecast, foretell | indicate by signs.; "These signs bode bad news" |
| ~ mark | designate as if by a mark.; "This sign marks the border" |
| ~ tell | let something be known.; "Tell them that you will be late" |
| adj. | 6. signal | notably out of the ordinary.; "the year saw one signal triumph for the Labour party" |
| ~ impressive | making a strong or vivid impression.; "an impressive ceremony" |
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