Primary

The word Primary when used alone may refer to any of the following:

• Primary (astronomy), the larger of two co-orbiting bodies
• Primary is used for the name of the primary mirror in a telescope.
• Primary (band), from Australia
• Primary circuit, electrical circuit in a Transformer that receives current, as opposed to secondary circuit
• A primary election by which a political party selects and nominates a candidate
• Power line that is 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

Mathematics

In mathematics, primary generally refers to a prime power p^k (a prime number raised to a power) or related concepts, including:

• Primary decomposition, a decomposition into primary ideals
• Primary group, or simply p-group, a group of prime power order
• Primary ideals, a concept in commutative algebra

Gaming

Primary, a game on Armor Games.

See also

• Primary, the first stage in a thermonuclear explosive, may also be used alone in a lower-yield nuclear explosive
• 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 Music, Israeli record label
• Primary school, a school providing primary education
• Primary source