ɪntə(ɹ)ˈtʃeɪndʒ ɪntɚˈtʃeɪndʒ ɹɪˈpleɪs ˈsʌbstɪtʃuːt ˈsʌbstɪtut put in the place of another; switch seemingly equivalent items the con artist replaced the original with a fake Rembrandt substitute regular milk for fat-free milk synonyms can be interchanged without changing the context's meaning