lasting for an indefinitely long time; enduring

her perennial beauty.

(of plants) having a life cycle lasting more than two years.

lasting or continuing throughout the entire year, as a stream.

perpetual; everlasting; continuing; recurrent.

a perennial plant

Daffodils and tulips are perennials.

something that is continuing or recurrent.

adjective

changing , intermittent , interrupted

adjective

abiding , annual , ceaseless , chronic , constant , continual , continuing , deathless , durable , eternal , everlasting , immortal , imperishable , incessant , inveterate , lasting , lifelong , long-lasting , long-lived , longstanding , never-ending , old , perdurable , permanent , persistent , recurrent , seasonal , sustained , unceasing , unchanging , undying , unfailing , uninterrupted , yearlong , yearly , enduring , long-standing , changeless , fixed , geophyte , perpetual , plant , timeless