primary

a preliminary election where delegates or nominees are chosen

one of the main flight feathers projecting along the outer edge of a bird's wing

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

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"

of first rank or importance or value; direct and immediate rather than secondary; "primary goals"; "a primary effect"; "primary sources"; "a primary interest"

not derived from or reducible to something else; basic; "a primary instinct"

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"

of or being the essential or basic part; "an elementary need for love and nurturing"

of primary importance