Definition of guest noun from the Oxford Advanced American Dictionary

      

    guest

     noun
    noun
    NAmE//ɡɛst//
     
     
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  1. 1 a person that you have invited to your house or to a particular event that you are paying for We have guests staying this weekend. more than 100 wedding guests I went to the theater as Helen's guest. He was the guest of honor (= the most important person invited to an event). Liz was not on the guest list.
  2. 2 a person who is staying at a hotel, etc. We have room for 500 guests. Guests should vacate their rooms by 10:30 a.m.
  3. 3a famous person or performer who takes part in a television show or concert a guest artist/star/singer Our special guest tonight is… He made a guest appearance on the show.
  4. 4a person who is invited to a particular place or organization, or to speak at a meeting The scientists are here as guests of our government. a guest speaker
  5. Idioms
    be my guest(informal)
     
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    used to give someone permission to do something that they have asked to do “Do you mind if I use the phone?” “Be my guest.”
See the Oxford Advanced Learner's Dictionary entry: guest