primary Look up primary at Dictionary.com
1471, "of the first order," from L. primarius "of the first rank, chief, principal, excellent," from primus "first" (see prime (adj.) ). Primary color is first recorded 1612; primary school is 1802, from Fr. école primaire.
"The Paris journals ... are full of a plan, brought forward by Fourcroy, for the establishment of primary schools, which is not interesting to an English reader." [London "Times," April 27, 1802]
Primary election is recorded from 1792, with ref. to France; in a U.S. context, recorded from 1835; earlier primary caucus (1821).