1. oxidation number the degree of oxidation of an atom or ion or molecule
  2. registration number the number on the license plate that identifies the car that bears it
  3. octane number a measure of the antiknock properties of gasoline
  4. oxidation state the degree of oxidation of an atom or ion or molecule
  5. oxidation the process by which a substance combines with oxygen
  6. fixed-point number a number represented in fixed-point notation
  7. opposite number a person or thing having the same function or characteristics as another
  8. identification number a numeral or string of numerals that is used for identification
  9. irrational number a real number that cannot be expressed as a rational number
  10. accommodation ladder (nautical) a portable ladder hung over the side of a vessel to give access to small boats alongside
  11. extortioner a criminal who extorts money from someone by threatening to expose embarrassing information about them
  12. exudation the slow escape of liquids from blood vessels through pores
  13. stationery paper cut to an appropriate size for writing letters
  14. accommodation endorser a person who endorses a promissory note without compensation or benefit but simply as a favor to the borrower
  15. juxtaposition the act of positioning close together
  16. ordinal number the number designating place in an ordered sequence
  17. excitation the state of being emotionally aroused and worked up
  18. oxidation-reduction a reversible chemical reaction in which one reaction is an oxidation and the reverse is a reduction
  19. atomic number quantity of protons in the nucleus of an atom of an element
  20. stationary not capable of being moved

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