Primary
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Look up primary in Wiktionary, the free dictionary.
Primary may refer to:
- Primary (astronomy), the larger of two co-orbiting bodies
 - Primary mirror, principal light-gathering surface of a reflecting telescope
 - Primary (band), from Australia
 - Primary circuit, electrical circuit in a transformer that receives current, as opposed to secondary circuit
 - Primary election, an election by which a political party selects and nominates a candidate
 - Power line, electric power transmission line fed to or from a transformer
 - Primary (film), 1960 documentary
 - Primary (LDS Church), children's Sunday School organization
 - "Primary" (song), by The Cure
 - Primary, the oldest period in the Geologic time scale (obsolete)
 - "Primary", a song by Spoon from the album Telephono
 - Primaries, remiges (wing feathers) in birds
 - Primaries or primary beams, in E. E. Smith's science-fiction series Lensman
 - The first stage in a thermonuclear explosive, may also be used alone in a lower-yield nuclear explosive, see nuclear weapon design
 
Mathematics
- Prime power, positive integer power of a prime number
 - Primary decomposition, a decomposition into primary ideals
 - p-group, a group of prime power order
 - Primary ideals, a concept in commutative algebra
 
See also
- Primary education, the first stage of compulsory education
 - Primary field, a type of field in conformal field theory
 - Primary Flight Training, in the U.S. Navy
 - Primary FRCA, academic examination for anaesthetists in the U.K.
 - Primary group (disambiguation)
 - Primary Music, Israeli record label
 - Primary school, a school providing primary education
 - Primary source