Two-aspect railway signal



  • A sequence of states representing an encoded message in a communication channel.
  • Any variation of a quantity or change in an entity over time that conveys information upon detection.
  • A sign made to give notice of some occurrence, command, or danger, or to indicate the start of a concerted action.
  • An on-off light, semaphore, or other device used to give an indication to another person.
  • An electromagnetic action, normally a voltage that is a function of time, that conveys the information of the radio or TV program or of communication with another party.
  • An action, change or process done to convey information and thus reduce uncertainty.
  • A token; an indication; a foreshadowing; a sign.
  • Useful information, as opposed to noise.
  • A simple interprocess communication used to notify a process or thread of an occurrence.
  • A signalling interaction between cells



  • Standing above others in rank, importance, or achievement.


Opposite words


  • From Old French segnal, seignal or Medieval Latin signāle; noun use of the neuter of Late Latin signālis, from Latin signum; verb use from 1805, as a shortened from signalize (1650s).

Modern English dictionary

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