I. pe ‧ ren ‧ ni ‧ al 1 /pəˈreniəl/ BrE AmE adjective
[ Date: 1600-1700 ; Language: Latin ; Origin: perennis , from per- 'through' + annus 'year' ]
1 . continuing or existing for a long time, or happening again and again:
Lack of resources has been a perennial problem since the beginning.
Teddy bears are a perennial favorite with children.
2 . a plant that is perennial lives for more than two years ⇨ annual
—perennially adverb
II. perennial 2 BrE AmE noun [countable]
a plant that lives for more than two years ⇨ annual
⇨ ↑ hardy perennial (1)