visitor

1. (sports, usually in the plural) Someone, or a team, that is playing away from home.Examples: "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."plural-normally

2. (law) A person authorized to visit an institution to see that it is being managed properly.Examples: "As to eleemoſynary corporations, by the dotation the founder and his heirs are of common right the legal viſitors, to ſee that that property is rightly employed, which would otherwiſe have deſcended to the viſitor himſelf: […]"

3. (ufology, specifically) An extraterrestrial being on Earth.Examples: "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."; "When we ask what evidence does in fact exist of extraterrestrial sojourns on our planet, we can start with what would surely be the best evidence of all: an actual visitor, or group of visitors, visible to crowds of people and ready for photo opportunities, television interviews, handshakes, polite conversation, and dancing."; "The visitor in Man Facing South-east claims pure altruism; Rantes (Hugo Soto) wants to alleviate the suffering of the poor and helpless."specifically

4. (British) 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.British

5. (software engineering) The object in the visitor pattern that performs an operation on the elements of a structure one by one.