Entry 2 senses · 2 variants Webster, 1913 backspace · IPA /ˈbækˌspeɪs/ n. v. i. 01 n. The key on a typewriter or other keyboard used for back spacing. 1. The key on a typewriter or other keyboard used for back spacing. Syn. backspace key. 02 v. i. In typing text, to press the backspace key so as to reposition the carriage or cursor on the previous space. 1. In typing text, to press the backspace key so as to reposition the carriage or cursor on the previous space.