primary

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”

of or being the essential or basic part

“an elementary need for love and nurturing”

“a basal reader”

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”