(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.

(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.

The abduction of a person by extraterrestrials.

(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.

plural of resident alien

(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.

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

(fandom slang) An implausible point of divergence from reality, used as a plot device in alternate history.

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

(neurology, psychiatry) A condition in which a person experiences their limbs acting seemingly on their own, without control over the actions.