sixth-former🔊nounEtymology From sixth form + -er.1Australia, UK A pupil in the sixth form.[T]hey were baffled by tears in moustached sixth-formers, by walls of impassivity in the Lower School, by silent conspiracies which nullified the rules.1956, Anthony Burgess, Time for a Tiger (The Malayan Trilogy), published 1972, page 37: