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Definition of alien

alien

/ˈeɪ.li.ən/
al · ien

Plural:aliens
•
Past Simple:aliened
•
Past Participle:aliened
•
Present Participle:aliening
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alien Lexical Profile

alien Game Scores & Validity

• adjective

1

Relating to or originating from a hypothetical or fictional being from another world.

Example

"The movie depicts an ancient alien civilization visiting Earth thousands of years ago."


2

Belonging to a foreign country, nation, or culture; unfamiliar and strange.

Example

"The explorers found themselves in an alien landscape of jagged volcanic rock."


3

Inconsistent with or repugnant to one's nature, beliefs, or accustomed experience (usually followed by 'to').

Example

"Deceit and manipulation were completely alien to her honest nature."

Synonyms
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Antonyms
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• noun

1

A hypothetical or fictional intelligent being from a planet other than Earth.

Example

"The science fiction novel tells the story of a peaceful alien stranded on Earth."


2

A foreigner, especially one who is not a naturalized citizen of the country where they are living.

Example

"Under the new statute, every resident alien was required to register with the local authorities."


3

A plant or animal species introduced to a habitat where it does not naturally occur.

Example

"Conservationists worked to remove the invasive alien before it could crowd out native wildflowers."

Synonyms
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Antonyms
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• verb

1

To transfer the ownership of property or a legal right to another person or entity (used chiefly in law).

Example

"The original landowner was legally prohibited from aliening the estate outside the family."


2

To cause someone to become estranged, indifferent, or hostile (now rare or archaic).

Example

"His harsh decrees gradually aliened the affections of his most loyal supporters."

Synonyms
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Antonyms
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Word Nuance & Usage

While 'alien' remains a standard legal and statutory term for a non-citizen resident, it is increasingly avoided in everyday and journalistic contexts in favor of 'non-citizen' or 'foreign national' due to its dehumanizing connotations.

• Rhymes for alien

Word Origin & Etymology

Borrowed in the 14th century from Old French 'alien', from Latin 'alienus' meaning 'belonging to another, strange, or foreign', a derivative of 'alius' meaning 'other'.

Cite this Entry


Wordmom. (2026). Definition of Alien. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/alien
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