Definition of register noun from the Oxford Advanced American Dictionary

      

    register

     noun
    noun
    NAmE//ˈrɛdʒəstər//
     
     
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    list of names
  1. 1 [countable] an official list or record of names, items, etc.; a book that contains such a list a church register (= of births, marriages, and deaths) to be on the register of voters Could you sign the hotel register please, sir?
  2. of voice/instrument
  3. 2[countable] (technology) the range, or part of a range, of a human voice or a musical instrument in the upper/middle/lower register
  4. of writing/speech
  5. 3[countable, uncountable] (linguistics) the level and style of a piece of writing or speech, that is usually appropriate to the situation that it is used in The essay suddenly switches from a formal to an informal register.
  6. for hot/cold air
  7. 4 [countable] an opening, with a cover that you can have open or shut, that allows hot or cold air from a heating or cooling system into a room compare vent
  8. machine
  9. 5 [countable] = cash register
See the Oxford Advanced Learner's Dictionary entry: register