the world > the universe > planet > primary planet > secondary planet, satellite > [noun] > time taken to perform orbit (3)
Astronomy. The time in which a celestial object, satellite, etc., performs one revolution about its primary (or about the centre of gravity of its…
(a) Astronomy = period, n. 7b; (b) Science = period, n. 7e.
The orbital period of a celestial object; = period, n. 7b. Now chiefly in periodic time n. (a) at periodic, adj.1 n.compounds.