After his mother died in 1910, Peano divided his time between teaching, working on texts aimed for secondary schooling including a dictionary of mathematics, and developing and promoting his and other auxiliary languages, becoming a revered member of the international auxiliary language movement.
Despois de que a súa nai morreu en 1910, Peano dividiu o seu tempo entre o ensino, traballando en textos orientados á escola secundaria (incluíndo un dicionario de matemáticas) e desenvolvendo e promovendo idiomas artificiais del e doutros, chegado a ser un membro reverenciado do movemento internacional de idiomas auxiliares.