trainer Syllabification: (train·er)Pronunciation: /ˈtrānər/Translate trainer | into French | into German | into Italian | into Spanish Definition of trainer noun 1a person who trains people or animals. informal an aircraft or simulator used to train pilots. 2a person whose job is to provide medical assistance to athletes. 3British a soft sports shoe suitable for casual wear. trainer in other Oxford dictionaries Definition of trainer in the British & World English dictionary