ringing

(′riŋ·iŋ)

(communications) The production of an audible or visible signal at a station or switchboard by means of an alternating or pulsating current.
(control systems) An oscillatory transient occurring in the output of a system as a result of a sudden change in input.

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adjective

Having or producing a full, deep, or rich sound: mellow, orotund, plangent, resonant, resounding, rotund, round, sonorous, vibrant. See sounds/pleasant sounds/unpleasant sounds/neutral sounds or silence.

IN BRIEF: n. - Having the character of a loud deep sound; The sound of a bell.

The bells are ringing; it's time to start.

Note: click on a word meaning below to see its connections and related words.

The noun has 3 meanings:

Meaning #1: the sound of a bell ringing
  Synonyms: ring, tintinnabulation

Meaning #2: the giving of a ring as a token of engagement

Meaning #3: having the character of a loud deep sound; the quality of being resonant
  Synonyms: plangency, resonance, reverberance, sonorousness, sonority, vibrancy

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The adjective ringing has one meaning:

Meaning #1: having a tendency to reverberate or be repeatedly reflected
  Synonym: reverberant

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