Oxford Dictionary English soft key noun noun BrE BrE//ˈsɒft kiː// ; NAmE NAmE//ˈsɔːft kiː// Add to my wordlistjump to other resultsa button on a a computer keyboard or mobile device which can be set to perform different functions The soft keys have different functions, depending on the phone. You can customize the functions of soft keys B and C.Check pronunciation: soft key oxfordlearnersdictionaries.com