different between adaptional vs adaptability

English

adaptional (comparative more adaptional, superlative most adaptional)

Relating or pertaining to adaptation, or the action of adapting.
(biology) Applied to the process by which an organism is fitted or adapted to its environment

From adaptable +? -ity

adaptability (countable and uncountable, plural adaptabilities)

The quality of being adaptable; a quality that renders adaptable.
(biology) Variability in respect to, or under the influence of, external conditions; susceptibility of an organism to that variation whereby it becomes suited to or fitted for its conditions of environment; the capacity of an organism to be modified by circumstances.

adaptability in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

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