Definition of primary noun from the Oxford Advanced Learner's Dictionary

  

primary

 noun
noun
BrE BrE//ˈpraɪməri//
 
; NAmE NAmE//ˈpraɪmeri//
 
Elections
 
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(pl. primaries) (also primary election) (in the US) an election in which people in a particular area vote to choose a candidate for a future important election the Illinois primary the presidential primaries He ran in the open primary for election as a state senator. the next round of primaries See related entries: Elections Wordfindercaucus, congress, the Electoral College, House of Representatives, nomination, president, primary, running mate, senate, swing state Word Origin late Middle English (in the sense ‘original, not derivative’): from Latin primarius, from primus ‘first’. The noun uses date from the 18th cent.
See the Oxford Advanced American Dictionary entry: primary