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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

communication go
something that is communicated by or to or between people or groups

sign, signal, signaling go
any nonverbal action or gesture that encodes a message

alarm, alert, warning signal, alarum
an automatic signal (usually a sound) warning of danger

noun.communication

9 Subcategories

torpedo go
a small explosive device that is placed on a railroad track and fires when a train runs over it
air alert go
the warning signal that begins a period of preparation for an enemy air attack
burglar alarm go
a loud warning signal produced by a burglar alarm
fire alarm go
a shout or bell to warn that fire has broken out
foghorn, fogsignal go
a loud low warning signal that can be heard by fogbound ships
horn go
a noise made by the driver of an automobile to give warning
red flag go
a flag that serves as a warning signal
siren go
a warning signal that is a loud wailing sound
tocsin, alarm bell go
the sound of an alarm (usually a bell)