With this definition of the particular substance (i.e., matter and form), Aristotle tries to solve the problem of the unity of the beings, for example, "what is it that makes a man one"?
wɪð ðɪs dˌɛfɪnˈɪʃən ʌvðə pɚtˈɪkjʊlɚ sˈʌbstəns ˈaɪ.ˈiː., mˈæɾɚɹ ænd fˈɔːɹm, ˈæɹɪstˌɑːɾəl tɹˈaɪz tə sˈɑːlv ðə pɹˈɑːbləm ʌvðə jˈuːnɪɾi ʌvðə bˈiːɪŋz, fɔːɹ ɛɡzˈæmpəl, "wˌʌt ɪz ɪt ðæt mˌeɪks ɐ mˈæn wˌʌn"?