1 : continuing forever or for a very long time without stopping • The region is in a state of perpetual war. • He seems to have aperpetual grin on his face. • (humorous) the perpetualstudent/bachelor
2 : happening all the time or very often • Lack of government funding has been a perpetual [=constant] problem for the organization. • the perpetual demands of parenthood
— perpetually adverb • The two civilizations were perpetually at war.