leaven

v. fermentar, aleudar, liudar, lleudar, ludiar, recentar

s. levadura, catalizador, fermento

levadura

Ex: But the leaven of the principles, promulgated by the International Federation, has not yet penetrated into more than half the lump of documentary material.

(n.) = estímulo
Ex: But the leaven of the principles, promulgated by the International Federation, has not yet penetrated into more than half the lump of documentary material.