[noun] [C] [plural] mottos or mottoes - a short sentence or phrase that expresses a principle of good or correct behaviourHis family motto is 'God helps those who help themselves.'The motto of the Royal Air Force is 'Per ardua ad astra' (= Through difficulty to the stars).
MOTTO
Meaning of MOTTO in English
Cambridge English vocab. Кембриджский английский словарь. 2012