Definition of they pronoun from the Oxford Advanced American Dictionary

      

    they

     pronoun
    pronoun
    NAmE//ðeɪ//
     
    (used as the subject of a verb)
     
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  1. 1people, animals, or things that have already been mentioned or are easily identified “Where are John and Liz?” “They went for a walk.” They (= the things you are carrying) go on the bottom shelf.
  2. 2used instead of he or she to refer to a person whose sex is not mentioned or not known If anyone arrives late they'll have to wait outside.
  3. 3people in general The rest, as they say, is history.
  4. 4people in authority or experts They cut my water off. They now say that red wine is good for you.
See the Oxford Advanced Learner's Dictionary entry: they