ɒl.ˈtɜː(ɹ).nət ˈɔl.tɚ.nət ɹɪˈpleɪsmənt ˈsʌbstɪtʃuːt ˈsʌbstɪtut ˌsʌbstəˈtuʃən ˌsʌbstɪˈtjuːʃən səkˈsɛsə(ɹ) ˈsʌɹəɡɪt ˈsɝəɡɪt swɪtʃ the act of furnishing an equivalent person or thing in the place of another replacing the star will not be easy a person or thing that takes or can take the place of another an event in which one thing is substituted for another the replacement of lost blood by a transfusion of donor blood a person who follows next in order he was President Lincoln's successor someone who takes the place of another person filling again by supplying what has been used up