plural of illegal alien

(chiefly US) An extraterrestrial being; a visitor from outer space.

plural of space alien

The coercion of a child into behaving in a hostile or fearful manner toward one of the parents.

(fandom slang) April 26, as a "fan holiday" celebrating the science-fiction horror franchise "Aliens". The date 4/26 is in reference to fictional planet LV-426 where the Xenomorph was first unveiled.

(law) Estrangement or loss of affection between two people who have a claim on each other's affections (such as two spouses or a parent and child) that is willfully caused by interference from a third party.

plural of coefficient of alienation

(statistics) A numerical measure of the lack of relationship between variables.

(philosophy, general) a person's feeling of disconnection and/or isolation from a group – whether friends, family, or wider society – or another individual due to low degree of integration or common values

The abduction of a person by extraterrestrials.