breathing Syllabification: (breath·ing)Pronunciation: /ˈbrēT͟HiNG/Translate breathing | into French | into Italian | into Spanish Definition of breathing noun 1the process of taking air into and expelling it from the lungs:his breathing was shallow 2a sign in Greek (῾ or ᾿) indicating the presence of an aspirate (rough breathing) or the absence of an aspirate (smooth breathing) at the beginning of a word. breathing in other Oxford dictionaries Definition of breathing in the British & World English dictionary