perturbational
Webster's Unabridged Dictionary:
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Per·tur·ba·tion·al
a.
Of or pertaining to perturbation, esp. to the perturbations of the planets. «The perturbational theory.» Sir J. Herschel.
Of or pertaining to perturbation, esp. to the perturbations of the planets. «The perturbational theory.» Sir J. Herschel.
