Definitions:

1. any incitement to action noun
   • They awaited the signal to start.
2. any nonverbal action or gesture that encodes a message noun
   • signals from the boat suddenly stopped
3. notably out of the ordinary adjective
   • the year saw one signal triumph for the Labour party

Synonyms:

• bespeak
• betoken
• indicate
• point
• sign
• signaling
• signalise
• signalize

NearBy Words:

• signal-noise
• signal-to-noise
• signaler
• signaling
• signalisation
• signalise
• signalization
• signalize
• signaller
• signally
• signalman