principal, main, beginning, basic, elementary, essential, original, particular, important, basal, more...

secondary, ancillary, auxiliary, subordinate, peripheral

open, closed, semi-open, semi-closed, more...

democratic, direct, presidential, first, republican, white, second, gubernatorial, open, national, unknown

the first,   the main thing,   first in importance,   more basic,   main factor,   coming first,   main place,   being the first,   most major,   first resort