a general sense, any thing that is described, or moved in a round, as the circumference of a circle, or surface of a globe.

Circular Numbers, called also spherical ones, according to some, are such whose powers terminate in the roots themselves. Thus, for instance, 5 and 6, all whose powers do end in 5 and 6, as the square of 5 is 25; the square of 6 is 36, &c.

Circular Sailing, is the method of sailing by the arch of a great circle. See Navigation.