1. noun
The Moons orbit around the Earth takes nearly one month to complete.
b) A sphere of influence; an area of control.
In the post WWII era, several eastern European countries came into the orbit of the Soviet Union.
2. verb
a) To circle or revolve around another object.
The Earth orbits the Sun.
b) To move around the general vicinity of something.
The harried mother had a cloud of children orbiting her, asking for sweets.
Wikipedia foundation.