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. Brinell number measure of the hardness of a material
  6. octane number a measure of the antiknock properties of gasoline
  7. real number any rational or irrational number
  8. ordinance an authoritative rule
  9. 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)
  10. natural number the number 1 and any other number obtained by adding 1 to it repeatedly
  11. 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
  12. cardinal flower North American lobelia having brilliant red flowers
  13. Jordan almond an almond covered with a sugar coating that is hard and flavored and colored
  14. jordan almond variety of large almond from Malaga, Spain
  15. ordnance military supplies
  16. atomic number quantity of protons in the nucleus of an atom of an element
  17. ordinariness the quality of being commonplace and ordinary
  18. index number a number or ratio derived from a series of observed facts
  19. ordinal being or denoting a numerical order in a series
  20. ordinary care the care that a reasonable man would exercise under the circumstances; the standard for determining legal duty

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