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early 15c., "of the first order," from Latin primarius "of the first rank, chief, principal, excellent," from primus "first" (see prime (adj.)). Meaning "first in order" is from 1802. Primary color is first recorded 1610s (at first the seven of the spectrum, later the three from which others can be made); primary school is 1802, from French 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]Related: Primarily.
1861, American English, short for primary election (1792, with reference to France; in a U.S. context from 1835); earlier primary caucus (1821).
primary pri·mar·y (prī'měr'ē, -mə-rē)
Being first or highest in importance; principal.
Occurring first in time or sequence; earliest.
Preliminary to a later stage of development; primordial; embryonic.
Of, relating to, or being a sequence of amino acids in a protein.
State elections of delegates to the nominating convention that chooses a major party's presidential candidate. In some states, delegates are elected by popular vote; in other states, party caucuses or miniconventions choose delegates.
Note: Primaries occur at different times during the presidential election year, a situation that drags out the process by which parties nominate candidates but allows wide public exposure to candidates and issues.