1.Definition: (astronomy) a celestial body (especially a star) relative to other objects in orbit around it

Category: Objects

2.Definition: a preliminary election where delegates or nominees are chosen

Category: General

3.Definition: coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit

"Current through the primary coil induces current in the secondary coil"

Category: Objects

4.Definition: one of the main flight feathers projecting along the outer edge of a bird's wing

Category: Animals