Find out what is diversity and why is diversity important to foster inclusivity and innovation in the workplace. Learn the benefits now. DIVERSITY definition : 1. the fact of many different types of things or people being included in something; a range of…. Learn more. According to the Oxford English Dictionary, “diversity” is defined as “ the practice or quality of including or involving people from a range of different social and ethnic backgrounds and of different genders, sexual orientations, etc.” [1]. Definition of diversity noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.