1. index number a number or ratio derived from a series of observed facts
  2. index finger the finger next to the thumb
  3. indexer someone who provides an index
  4. indexing the act of classifying and providing an index in order to make items easier to retrieve
  5. box number the number of a letter box at the post office where mail is collected
  6. taxonomer a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior
  7. wind exposure exposure to the wind
  8. PO box number the number of a letter box at the post office where mail is collected
  9. antechamber an outer room or waiting area that leads into another room
  10. ordinal number the number designating place in an ordered sequence
  11. index case the earliest documented case of a disease that is included in an epidemiological study
  12. index fund a mutual fund that invests in the stocks that are the basis of a well-known stock or bond index
  13. indecorum a lack of decorum
  14. outnumber be larger in number
  15. complex number (mathematics) a number of the form a+bi where a and b are real numbers and i is the square root of -1
  16. encumber hold back, impede, or weigh down
  17. atomic number quantity of protons in the nucleus of an atom of an element
  18. octane number a measure of the antiknock properties of gasoline
  19. index register a register used to determine the address of an operand
  20. Avogadro number the number of molecules in a mole of a substance

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