1. (a.) Continuing through the year or many years; as, perennial fountains; perpetual\.

2. (a.) Continuing without cessation or intermission; perpetual; unceasing; never failing.

3. (a.) Continuing more than two years; as, a perennial steam, or root, or plant.

4. (n.) A perennial plant; a plant which lives or continues more than two years, whether it retains its leaves in winter or not.

abiding age-long aged amphibian ancient angiosperm annual antique aquatic plant articulated biennial catenated ceaseless chattering chronic concatenated connected constant continual continued continuing continuous cosmopolite cutting cyclical deciduous deciduous plant dicot dicotyledon direct diuturnal durable endless enduring ephemeral eternal ever-blooming ever-new evergreen everlasting exotic featureless flowering plant fungus gametophyte gapless gymnosperm half-hardy hardy hydrophyte immediate immortal immutable imperishable incessant indeciduous interminable intransient inveterate joined jointless lasting lifelong linked long-lasting long-lived long-standing long-term longeval longevous machine gun macrobiotic monocot monocotyl monotonous never-ending never-failing nonstop of long duration of long standing old oscillating perdurable perduring periodic permanent perpetual persistent persisting plant polycot polycotyl polycotyledon pulsating rapid recurrent regular remaining repeated repetitive round-the-clock running seamless seed plant seedling sempervirent sempiternal serried smooth spermatophyte sporophyte stable staccato staying steadfast steady straight stuttering sustained thallophyte timeless tough triennial twenty-four-hour unbroken unceasing unchanging undifferentiated undying unending unfading unfailing uniform unintermitted unintermittent unintermitting uninterrupted unrelieved unremitting unstopped unvarying vascular plant vegetable vibrating vital weed