1. ordinal number the number designating place in an ordered sequence
  2. cardinal number the number of elements in a mathematical set
  3. irrational number a real number that cannot be expressed as a rational number
  4. rational number an integer or the quotient of two integers
  5. ordinariness the quality of being commonplace and ordinary
  6. Brinell number measure of the hardness of a material
  7. ordinance an authoritative rule
  8. ordinary shares stock other than preferred stock
  9. octane number a measure of the antiknock properties of gasoline
  10. ordnance military supplies
  11. real number any rational or irrational number
  12. Uredinales rust fungi: parasitic fungi causing rust in plants
  13. natural number the number 1 and any other number obtained by adding 1 to it repeatedly
  14. Cardinal Newman English prelate and theologian who (with John Keble and Edward Pusey) founded the Oxford movement; Newman later turned to Roman Catholicism and became a cardinal (1801-1890)
  15. ordinary lacking special distinction, rank, or status
  16. imaginary number (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1
  17. ordinary life insurance insurance on the life of the insured for a fixed amount at a definite premium that is paid each year in the same amount during the entire lifetime of the insured
  18. atomic number quantity of protons in the nucleus of an atom of an element
  19. cardinal flower North American lobelia having brilliant red flowers
  20. Jordan almond an almond covered with a sugar coating that is hard and flavored and colored

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