ðeɪ dᵻfˈaɪnd ɪɾ æz "ɐ pɹˈɑːsɛs ʌv ˌɪntɚpˌɛnɪtɹˈeɪʃən ænd fjˈuːʒən ɪnwˌɪtʃ pˈɜːsənz ænd ɡɹˈuːps ɐkwˈaɪɚ ðə mˈɛmɚɹiz, sˈɛntɪmənts, ænd ˈæɾɪtˌuːd ʌv ˈʌðɚ pˈɜːsənz ænd ɡɹˈuːps ænd, baɪ ʃˈɛɹɪŋ ðɛɹ ɛkspˈiəɹɪəns ænd hˈɪstɚɹi, ɑːɹ ɪŋkˈoːɹpɚɹˌeɪɾᵻd wɪð ðˌɛm ɪn ɐ kˈɑːmən kˈʌltʃɚɹəl lˈaɪf.
They defined it as "a process of interpenetration and fusion in which persons and groups acquire the memories, sentiments, and attitude of other persons and groups and, by sharing their experience and history, are incorporated with them in a common cultural life.