plurennialadj.
/plʊəˈrɛnɪəl/, /plɔːˈrɛnɪəl/, U.S. /plʊˈrɛniəl/ rare.
Lasting for more than one or two years; (also) occurring once in several years.
ΚΠ
1895 W. R. Fisher Schlich's Man. Forestry IV. 137 These [generations] may be single or annual, multiple, biennial or plurennial.
1926 Geografiska Annaler 8 276 The annual as well as the plurennial variations of the ice-recession had a common and evidently cosmic cause.
1996 Ecology 77 208/2 Because of the plurennial egg cycles of M. bicolor, a local population is only considered to have become extinct when a previously occupied patch remains empty during at least two successional years.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
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adj.1895