1. relationship or relation (to something). 
  2. A measurement one can compare to.
  3. Information about a person, provided by someone (a referee) with whom they are well acquainted
  4. reference work.
  5. (semantics) A relation between objects in which one object designates, or acts as a means by which to connect to or link to, another object.
  6. (academic writing) A short written identification of a previously published work which is used as a source for a text.
  7. (academic writing) A previously published written work thus indicated; a source.
  8. (programming) An object containing information which refers to data stored elsewhere, as opposed to containing the data itself.
  9. (programming, character entity) A special sequence used to represent complex characters in a web page such as ™ or €.
  10. (obsoleteappeal
    • Shakespeare
      Make your full reference.