Definition of breathing noun from the Oxford Advanced Learner's Dictionary

  

breathing

 noun
noun
BrE BrE//ˈbriːðɪŋ//
 
; NAmE NAmE//ˈbriːðɪŋ//
 
[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.Extra examples His breathing was uneven, and he could hardly speak. She picked up the phone and heard sounds of heavy breathing. Try breathing exercises to calm your nerves.
See the Oxford Advanced American Dictionary entry: breathing