Apparently a primary word; foreign (literally, alien, or figuratively, novel); by implication, a guest or (vice-versa) entertainer -- host, strange(-r).
Thayer's Greek Lexicon
Strong's 3581: ξένος
ξένος, ξένῃ, ξένον, from Homer down, masculine a guest-friend (Latinhopes (of parties bound by ties of hospitality)), i. e.:
1.a foreigner, stranger (opposed to ἐπιχώριος, Plato, Phaedo c. 2, p. 59 b.; Josephus, b. j. 5, 1, 3);
b. tropically, α. alien (from a person or thing); without knowledge of, without a share in: with a genitive of the thing, τῶνδιαθηκῶντῆςἐπαγγελίας, Ephesians 2:12 (cf. Winer's Grammar, § 30, 4, 6) (τοῦλόγου, Sophocles O. T. 219). β. new, unheard of: διδαχαι, Hebrews 13:9; ξένοντί a strange, wonderful thing, 1 Peter 4:12 (Aeschylus Prom. 688; Diodorus 3, 15 and 52; others).
2.one echo receives and entertains another hospitably; with whom he stays or lodges, a host: ὁξένοςμου, Romans 16:23, where καίτῆςἐκκλησίαςὅλης is added, i. e. either 'who receives hospitably all the members of the church who cross his threshold,' or 'who kindly permits the church to worship in his house' (Fritzsche).
Matthew 25:35 - Adj-NMS GRK:ἐποτίσατέ με ξένος ἤμην καὶ NAS: and you gave Me [something] to drink; I was a stranger, and you invited KJV: drink: I was a stranger, and ye took INT: you gave to drink me a stranger I was and
Matthew 25:38 - Adj-AMS GRK:σε εἴδομεν ξένον καὶ συνηγάγομεν NAS: did we see You a stranger, and invite KJV: thee a stranger, and INT: you saw we a stranger and took [you] in
Matthew 25:43 - Adj-NMS GRK:ξένος ἤμην καὶ NAS:I was a stranger, and you did not invite KJV: I was a stranger, and ye took INT:a stranger I was and
Matthew 25:44 - Adj-AMS GRK:διψῶντα ἢ ξένον ἢ γυμνὸν NAS: thirsty, or a stranger, or naked, KJV: athirst, or a stranger, or naked, INT: thirsting or a stranger or naked
Matthew 27:7 - Adj-DMP GRK:ταφὴν τοῖς ξένοις NAS: Field as a burial place for strangers. KJV: to bury strangers in. INT: a burial place for the strangers
Acts 17:18 - Adj-GNP GRK:οἱ δέ Ξένων δαιμονίων δοκεῖ NAS: to be a proclaimer of strange deities,-- KJV: a setter forth of strange gods: INT: Others moreover Of foreign gods he seems
Acts 17:21 - Adj-NMP GRK:οἱ ἐπιδημοῦντες ξένοι εἰς οὐδὲν NAS: the Athenians and the strangers visiting KJV: and strangers which INT: the visiting strangers in nothing
Romans 16:23 - Adj-NMS GRK:Γαῖος ὁ ξένος μου καὶ NAS: Gaius, host to me and to the whole KJV: Gaius mine host, and of the whole INT: Gaius the host of me and
Ephesians 2:12 - Adj-NMP GRK:Ἰσραὴλ καὶ ξένοι τῶν διαθηκῶν NAS: of Israel, and strangers to the covenants KJV: and strangers from the covenants INT: of Israel and strangers from the covenants
Ephesians 2:19 - Adj-NMP GRK:οὐκέτι ἐστὲ ξένοι καὶ πάροικοι NAS: you are no longer strangers and aliens, KJV: no more strangers and INT: no longer are you strangers and aliens
Hebrews 11:13 - Adj-NMP GRK:ὁμολογήσαντες ὅτι ξένοι καὶ παρεπίδημοί NAS: and having confessed that they were strangers and exiles KJV: that they were strangers and pilgrims INT: having confessed that strangers and exiles
Hebrews 13:9 - Adj-DFP GRK:ποικίλαις καὶ ξέναις μὴ παραφέρεσθε NAS: by varied and strange teachings; KJV: with divers and strange doctrines. For INT: various and strange not be carried about
1 Peter 4:12 - Adj-GNS GRK:γινομένῃ ὡς ξένου ὑμῖν συμβαίνοντος NAS: as though some strange thing were happening KJV: as though some strange thing happened INT: [which is] taking place as if a strange thing to you [is] happening
3 John 1:5 - Adj-AMP GRK:καὶ τοῦτο ξένους NAS: and especially [when they are] strangers; KJV: and to strangers; INT: and they are strangers