(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

plural of coefficient of alienation

(law) A common law tort that can be brought against the third party alleged to be responsible for the failure of marriage; abolished in many jurisdictions.

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

A supposed disturbance in which children are obsessively preoccupied with depreciation and/or criticism of a parent.

(sometimes offensive) A person who is within the boundaries of a political state without the authorization of the government of that state; a national of another country who has entered or stayed without permission.

The abduction of a person by extraterrestrials.

plural of space alien

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

(US, law) A person born outside the United States who has legally established temporary or permanent residence in the United States, but has not become a United States citizen.