Alien - Vine's Expository Dictionary of New Testament Words
Alien[ 1,,G245, allotrios ]
primarily, belonging to another" (the opposite to idios, "one's own"), came to mean "foreign, strange, not of one's own family, alien, an enemy;" "aliens" in Hebrews 11:34, elsewhere "strange," etc. See MAN'S, Note
(1), STRANGE, STRANGER.