differentiation
development in the speech language where the distinction between two neighboring sounds (more precisely phonemes) is increased
en-GB/ˌdɪfəɹɛnʃɪˈeɪʃn/
en-US/dɪfɚˌɛnʃiˈeɪʃən/
development in the speech language where the distinction between two neighboring sounds (more precisely phonemes) is increased