alien
A creature or person that comes from another planet, not from Earth.
A living being that comes from a planet other than Earth, especially in science fiction or discussions about life in space.
Very new and strange to someone; not part of their normal life, ideas, or feelings.
Very strange, unfamiliar, or different from what someone is used to, often suggesting that it does not fit naturally with a person, place, or set of ideas.
A person who lives in a country but is not a citizen of that country, used mainly in law and official writing.
A person who lives in a country where they do not have citizenship, especially as a formal legal term.
From another country or culture; not native to that place.
Relating to, coming from, or belonging to a different country, people, or culture; foreign.
From another planet, not from Earth.
Coming from or relating to a planet other than Earth, especially in science fiction or discussions about life in space.
- Base: alien
- Base: alien
- Plural: aliens
alien invasion
1attack on Earth by aliens
An attack on Earth by creatures from another planet, especially in movies, books, and games.
- The movie is about an alien invasion that starts in a small coastal town.
- He loves games that let you defend the planet from an alien invasion.
- The comic tells the story of a failed alien invasion of Earth.
alien life
1life beyond Earth
Life that exists somewhere in the universe other than on Earth.
- Scientists debate how likely alien life is in our galaxy.
- The telescope was built to search for signs of alien life.
- Many people enjoy stories that imagine alien life visiting Earth.
alien to [someone/something]
1completely unfamiliar or not fitting
To be very strange or not normal for a person, group, or situation.
- The idea of strict time schedules was alien to the villagers.
- Honest discussion is alien to a culture of fear.
- Fast internet was alien to many remote communities until recently.
illegal alien
1non-citizen without legal status
A non‑citizen who lives in a country without official permission, used mainly in law and politics; often seen as negative or offensive in everyday speech.
- The new bill changes how the government treats an illegal alien who has lived in the country for many years.
- Many organizations avoid using the term "illegal alien" because of its negative tone.
- The report estimated the number of illegal aliens working in the region.
resident alien
1non-citizen with legal residence
A person who is not a citizen of a country but has official permission to live there, especially in tax and immigration law.
- As a resident alien, she must file a special tax form each year.
- The application explains the rights and duties of a resident alien.
- He changed his status from visitor to resident alien after getting a work visa.