UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/əˈnʌnsɪˌeɪtə/US:USA pronunciation: respellingUSA pronunciation: respelling(ə nunsē ā′tər)

WordReference Random House Unabridged Dictionary of American English © 2020
an•nun•ci•a•tor  (ə nunsē ā′tər),USA pronunciation n. 
  1. an announcer.
  2. Electricitya signaling apparatus, generally used in conjunction with a buzzer, that displays a visual indication when energized by electric current.
an•nun•ci•a•to•ry  (ə nunsē ā′tər),USA pronunciation adj. 
  • see annunciate, -tor 1745–55; annūntiātor

Collins Concise English Dictionary © HarperCollins Publishers::
annunciator /əˈnʌnsɪˌeɪtə/ n
  1. a device that gives a visual indication as to which of a number of electric circuits has operated, such as an indicator in a hotel showing in which room a bell has been rung
  2. a device giving an audible signal indicating the position of a train
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