visitor

noun8

1. •
   a person who comes to see someone, sometimes staying with them as a guest

   • He ventured to raise his eyes again, and found his supernatural visitor confronting him in an erect attitude, with its chain wound over and about its arm. — 1843
2. •
   Someone who pays a visit to a specific place or event; a sightseer or tourist.

   • Belgrade knew how to show visitors a good time, thanks to its fashionable, somewhat raucous nightclub and bar scene. — 2023
3. •
   [usually plural] Someone, or a team, that is playing away from home.

   • But, somewhat against the run of play, Craddock fired the visitors ahead, volleying a low effort beyond Simon Mignolet after Sunderland twice failed to clear attempted crosses from Stephen Hunt. — 2011
4. •
   An extraterrestrial being on Earth.

   • 5: Of course there is always the remote (I hope) possibility that instant panic will prompt us to send a hailstorm of nuclear warheads out upon the visitor. — 1979
5. •
   An object which lands or passes by Earth or its orbit.

   • This satellite, they suspect, is a visitor sent by the “superior beings” of a community of other stars within our Milky Way galaxy. — 1977
6. •
   A person authorized to visit an institution to see that it is being managed properly.
7. •
   (UK) A head or overseer of an institution such as a college (in which case, equivalent to the university's chancellor) or cathedral or hospital, who resolves disputes, gives ceremonial speeches, etc.
8. •
   The object in the visitor pattern that performs an operation on the elements of a structure one by one.