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• Ordinal adjectives:
  • Primary "first", first hand.
  • Secondary "second", second hand.
  • Tertiary "third", third hand.
• In organic chemistry:
  • Primary : functional group attached to carbon atom connected to 1 or no other Carbon atoms
  • Secondary: functional group attached to carbon atom connected to 2 other Carbon atoms
  • Tertiary: functional group attached to carbon atom connected to 3 other Carbon atoms
  • Quaternary: functional group (or usually ion) attached to carbon atom connected to 4 other Carbon atoms
• In physics, the term primary can refer to the most massive component of a gravitationally bound system: see satellite.
• In electrical or electronics engineering, primary refers the driven winding of a transformer
• In politics, primary is short for primary election.
• The movie Primary.
• The Primary beams, or Primaries, used in E. E. Smith's Lensman series. The energy required to generate the beam was such that after firing, each projector had to be discarded as the energy of the primary beam quickly rendered it useless.
• In the United Kingdom medical fraternity, the 'Primary' is short for the Primary Examination of the Diploma of Fellowship of the Royal College of Anaesthetists, or 'Primary FRCA'.

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