botany A plant lasting for three seasons or more.

Roget 367: vegetable, vegetable kingdom; flora, verdure.    plant; tree, shrub, bush; creeper; herb, herbage; grass.    annual; perennial, biennial, triennial; exotic.    timber, forest; wood, woodlands; timberland; hurst^†, frith^†, holt, weald^†, park, chase, greenwood, brake, grove, copse, coppice, bocage^†, tope, clump of trees, thicket, spinet, spinney; underwood, brushwood; scrub; boscage, bosk^†, ceja [Sp.], chaparal, motte [U.S.]; arboretum etc. 371.    bush, jungle, prairie; heath, heather; fern, bracken; furze, gorse, whin; grass, turf; pasture, pasturage; turbary^†; sedge, rush, weed; fungus, mushroom, toadstool; lichen, moss, conferva^†, mold; growth; alfalfa, alfilaria^†, banyan; blow, blowth^†; floret^†, petiole; pin grass, timothy, yam, yew, zinnia.    foliage, branch, bough, ramage^†, stem, tigella^†; spray etc. 51; leaf.    flower, blossom, bine^†; flowering plant; timber tree, fruit tree; pulse, legume.    ... show more

Polish: bylina

Lasting three seasons or more.

Roget 69: continuous, continued; consecutive; progressive, gradual; serial, successive; immediate, unbroken, entire; linear; in a line, in a row etc. n.; uninterrupted, unintermitting^†; unremitting, unrelenting (perseverence) 604.1; perennial, evergreen; constant.    ... show more

Roget 110: durable; lasting etc. v.; of long duration, of long-standing; permanent, endless, chronic, long-standing; intransient^†, intransitive; intransmutable^†, persistent; lifelong, livelong; longeval^†, long-lived, macrobiotic, diuturnal^†, evergreen, perennial; sempervirent^†, sempervirid^†; unrelenting, unintermitting^†, unremitting; perpetual etc. 112.    lingering, protracted, prolonged, spun out etc. v.. long-pending, long-winded; slow etc. 275.    ... show more

Roget 150: unchangeable, immutable; unaltered, unalterable; not to be changed, constant; permanent etc. 141; invariable, undeviating; stable, durable; perennial etc. (diuturnal) 110^†.    fixed, steadfast, firm, fast, steady, balanced; confirmed, valid; fiducial^†; immovable, irremovable, riveted, rooted; settled, established etc. v.; vested; incontrovertible, stereotyped, indeclinable.    tethered, anchored, moored, at anchor, on a rock, rock solid, firm as a rock; firmly seated, firmly established etc. v.; deep-rooted, ineradicable; inveterate; obstinate etc. 606.    transfixed, stuck fast, aground, high and dry, stranded.    [movable object rendered unmovable] stuck, jammed; unremovable; quiescent etc. 265; deterioration etc. 659.    indefeasible, irretrievable, intransmutable^†, incommutable^†, irresoluble^†, irrevocable, irreversible, reverseless^†, inextinguishable, irreducible; indissoluble, indissolvable^†; indestructible, undying, imperishable, incorruptible, indelible, indeciduous^†; insusceptible, insusceptible of change.    ... show more

Lasting an indefinitely long time; suggesting self-renewal.

Recurring again and again:
— Perennial efforts to stipulate the requirements.

synonyms: recurrent, repeated.