Sĕx'a-gĕs'i-mal, a.

a. [Fr. sexagesimal. See supra.] Pertaining to, or founded on, the number sixty.

Sexagesimal fractions, or sexagesimals, those fractions whose denominators are some power of sixty; as, ¹⁄₆₀, ¹⁄₃₆₀₀, ¹⁄₂₁₆₀₀₀;—called also astronomical fractions, because formerly there were no others used in astronomical calculations. Hutton.—Sexagesimal, or sexagenary, arithmetic, the method of computing by the sexagenary scale, or by sixties.