1. central heating a heating system in which air or water is heated at a central furnace and sent through the building via vents or pipes and radiators
  2. conservative resistant to change
  3. concentration the spatial property of being crowded together
  4. disconcerting causing an emotional disturbance
  5. concentrate make denser, stronger, or purer
  6. endurance riding riding for long hours over long distances
  7. scintillating having brief brilliant points or flashes of light
  8. conditional relation a logical relation between propositions p and q of the form `if p then q'; if p is true then q cannot be false
  9. concealing covering or hiding
  10. concertina free-reed instrument played like an accordion by pushing its ends together to force air through the reeds
  11. glycerogelatin a medicated skin preparation made from glycerin and glycerinated gelatin
  12. concentric having a common center
  13. concerned feeling or showing worry about something
  14. general relativity a generalization of special relativity to include gravity
  15. Cancer borealis large red deep-water crab of the eastern coast of North America
  16. concert grand a grand piano suitable for concert performances
  17. competence hearing a hearing to determine legal capacity
  18. conservation careful management of the environment and natural resources
  19. glycerinated gelatin a gelatinous preparation made from gelatin and glycerin and water; used as a base for ointments and suppositories
  20. business relation a relation between different business enterprises