S: (n) primary ((astronomy) a celestial body (especially a star) relative to other objects in orbit around it)
S: (n) primary coil, primary winding, primary (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"
Adjective
S: (adj) primary (of first rank or importance or value; direct and immediate rather than secondary) "primary goals"; "a primary effect"; "primary sources"; "a primary interest"
S: (adj) primary (not derived from or reducible to something else; basic) "a primary instinct"
S: (adj) chief, main, primary, principal, master (most important element) "the chief aim of living"; "the main doors were of solid glass"; "the principal rivers of America"; "the principal example"; "policemen were primary targets"; "the master bedroom"; "a master switch"
S: (adj) elementary, elemental, primary, basal (of or being the essential or basic part) "an elementary need for love and nurturing"; "a basal reader"