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Webster 1913 Edition

Adj.

Of or pertaining to a succession; existing in a regular order; consecutive.

“Successional teeth.”

Flower.

–

Suc-ces′sion-al-ly

adv.

successional ‎(not comparable)

Of, related to or caused by succession
- 1988 April 15, James Krohe Jr., “Where Has All the Flora Gone?”, in Chicago Reader:
  Surviving plant communities can be compared to their ancestors, and the differences between them reveal the changes wrought by climate, by pollution, by natural successional processes.

of, related to or caused by succession