"E pluribus unum," e.g. (5)
(Other definitions for latin that I've seen before include "a quarter of Parisians" , "difficult subject" , "ancient tongue" , "Language of Cicero" , "Learning it 'an honour' (Churchill)" .)
(Other definitions for motto that I've seen before include "Phrase to express character" , "Favourite saying of a group" , "Saying in a cracker" , "Recurring musical phrase" , "Cracker slip" .)