Astronomy. = periodic, adj.1 1. Now rare.

Astronomy. Of or relating to the recurring motion of a celestial object, esp. in its orbit or apparent orbit.

Astronomy and Astrology. Of or relating to the revolution of a planet or other celestial object. Now rare.

Of, relating to, or of the nature of an orbit; = orbital, adj. 2.

Of, belonging to, or of the nature of an orbit (orbit, n. 2), esp. that of a celestial object; moving or taking place in an orbit or circular path…

Of, relating to, or of the nature of an orbit; = orbital, adj. 2.

That orbits (in various senses of the verb).