Definition of breathing noun from the Oxford Advanced American Dictionary

  

breathing

 noun
noun
NAmE//ˈbriðɪŋ//
 
[uncountable]
 
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 the action of taking air into the lungs and sending it out again Her breathing became steady and she fell asleep. Deep breathing exercises will help you relax. Heavy (= loud) breathing was all I could hear.
See the Oxford Advanced Learner's Dictionary entry: breathing