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From The Collaborative International Dictionary of English v.0.48:
Orbital \Or"bit*al\, a. Of or pertaining to an orbit. "Orbital revolution." --J. D. Forbes. [1913 Webster] Orbital index (Anat.), in the skull, the ratio of the vertical height to the transverse width of the orbit, which is taken as the standard, equal to 100. [1913 Webster]