1.AdjectiveLasting forever, or for an indefinitely long time.
2.AdjectiveSet up to be in effect or have tenure for an unlimited duration.
"perpetual copyright"
3.AdjectiveContinuing; uninterrupted.
4.AdjectiveFlowering throughout the growing season.
"By means of artificial hybridization, practised for a series of years, he has succeeded in producing a race of carnations which are perpetual bloomers.; The hybrid perpetual roses as a rule require to be pruned to within 4 to 6 inches of the ground."