tab (2)EnglishOxford New American Dictionarytab2 /tab, tæb / ▸ noun a facility in a word-processing program, or a device on a keyboard, for advancing to a sequence of set positions in tabular work: [as modifier] the tab key set tabs at 1.4 inches and 3.4 inches. ▸ verb (tabs, tabbing, tabbed) 1 [no object] use the tab key on a computer or typewriter keyboard: the user can tab to the phrase and press Enter. 2 [with object] short for tabulate. – ORIGIN early 20th century : short for tabulator.