名詞 perennial:

1. a plant lasting for three seasons or more

形容詞 perennial:

1. lasting three seasons or more
2. lasting an indefinitely long time; suggesting self-renewal
3. recurring again and again
   同義詞：recurrent, repeated

1. A perennial woody plant having a main trunk and usually a distinct crown.
   樹一種多年生木質(zhì)植物，生有一個主干且常有一個很明顯的樹冠

per.en.ni.al

adj.（形容詞）
Lasting or active through the year or through many years.
常綠的：全年或多年都充滿生機

Lasting an indefinitely long time; enduring:
持久的：持續(xù)很長時間的；持久的：
例句：
perennial happiness.
永久的幸福

Appearing again and again; recurrent.See Synonyms at continual
不斷出現(xiàn)的；重現(xiàn)的參見 continual
Botany Living three or more years.
【植物學(xué)】 多年生的：生長三年或三年以上的
n.（名詞）
Botany A perennial plant.
【植物學(xué)】 多年生植物
Something that recurs or seems to recur on a yearly or continual basis:
長期存在的：長期或持續(xù)存在，反復(fù)出現(xiàn)的：
例句：
.that hardy perennial, the budget deficit.(David S. Broder)
.長期存在的預(yù)算赤字.(戴維S.布羅德)

來源：
Latin perennis per- [throughout] * see per annus [year] * see at-
拉丁語 perennis per- [通過] *參見 per annus [年] *參見 at-
-al
-al

【引伸】
peren.nially
adv.（副詞）