Oxford Dictionary English running mate nounnoun BrE BrE//ˈrʌnɪŋ meɪt// ; NAmE NAmE//ˈrʌnɪŋ meɪt// [usually singular] (politics) Elections Add to my wordlistjump to other results(in the US) a person who is chosen by the candidate in an election, especially that for president, to support them and to have the next highest political position if they win The presidential nominee was advised to choose a woman as a running mate. Wordfindercongresscaucus, congress, the Electoral College, House of Representatives, nomination, president, primary, running mate, senate, swing state See related entries: ElectionsSee running mate in the Oxford Advanced American DictionaryCheck pronunciation: running mate oxfordlearnersdictionaries.com