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annuation

noun
an·​nu·​a·​tion | \ ˌanyəˈwāshən\
plural -s

Definition of annuation

1 : annual variation in the presence or absence or the abundance of particular members of a plant community usually relatable to annual climatic variation — compare aspection
2 : ecological observations made over a period of years

First Known Use of annuation

1939, in the meaning defined at sense 1

History and Etymology for annuation

annu(al) + -ation

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