Definition of ALIEN

ALIEN Noun and Adjective

Alien functions both as a noun and as an adjective. As a noun, it refers to a being, creature, or entity originating from a different planet, celestial body, or realm than Earth. It is commonly associated with extraterrestrial life forms, often depicted in science fiction literature, films, and popular culture. As an adjective, it describes something that is foreign, unfamiliar, or unrelated to one’s own experience, environment, or culture.

ALIEN as a noun

Noun – Extraterrestrial Being: As a noun, alien denotes an inhabitant of another world or planetary system, characterized by distinct physical attributes, technological capabilities, or cultural practices. The concept of aliens has captivated human imagination for centuries, fueling speculation about the existence of life beyond Earth.

Noun – Legal and Political Context: In legal and political contexts, alien can refer to a foreign national or non-citizen residing in a country where they do not have citizenship or permanent residency status. In this sense, aliens may be subject to immigration laws, visa requirements, and regulations governing their presence and activities within a host country.

Noun – Otherness and Difference: The term alien can also convey a sense of otherness or difference, emphasizing the unfamiliarity or strangeness of something perceived as foreign or unfamiliar. It may be used metaphorically to describe individuals, ideas, or phenomena that are perceived as outside the norms or boundaries of a particular group or society.

Noun – Psychological and Existential Themes: In psychological and existential contexts, alien may evoke themes of isolation, estrangement, or disconnection, reflecting feelings of being out of place or disconnected from one’s surroundings or identity. It can explore questions of belonging, identity, and the search for meaning in a vast and sometimes incomprehensible universe.

ALIEN as an adjective

Adjective – Foreign or Unfamiliar: As an adjective, alien describes something that is not native to or characteristic of a particular place, environment, or context. It conveys the idea of being strange, different, or unfamiliar, often evoking feelings of unease, disconnection, or estrangement.

Adjective – Otherworldly or Exotic: In the context of science fiction and fantasy, alien can also denote something that is distinctly otherworldly or exotic, whether in terms of its physical appearance, behavior, or cultural practices. It is associated with the imaginative exploration of new worlds, species, and civilizations beyond the bounds of Earth.

Adjective – Legal and Political: In legal and political contexts, alien as an adjective may describe individuals, organizations, or actions that are foreign or external to a particular jurisdiction or system. It can refer to non-citizen residents, foreign-owned assets, or activities conducted by foreign entities within a host country.

Adjective – Psychological and Social: Alien as an adjective can also relate to psychological or social experiences of estrangement, isolation, or disconnection from one’s surroundings or community. It may describe feelings of being out of place, misunderstood, or marginalized within a larger social or cultural context.

In conclusion, alien serves as both a noun and an adjective, encompassing notions of extraterrestrial beings, foreign nationals, foreignness, unfamiliarity, and otherness. Whether describing beings from outer space or the psychological experience of estrangement, the concept of alienhood prompts reflection on our perceptions of the unknown, our relationships with others, and the diversity of experiences and perspectives in the world.

Examples of ALIEN in a sentence

ALIEN in a sentence as a noun

  • An alien is a term used to describe a foreign national residing in a country where they do not have citizenship.
  • The science fiction movie featured an alien species with advanced technology and unique characteristics.
  • The concept of alien aliens has fascinated humans for centuries, inspiring countless works of fiction.
  • Governments have laws and policies in place to regulate the rights and status of aliens within their borders.
  • The witness claimed to have seen an alien spacecraft hovering in the sky late at night.
  • In legal contexts, an alien is someone who is not a citizen or national of a particular country.
  • The protagonist of the novel encounters an alien civilization during their space exploration mission.
  • Some people believe that aliens have visited Earth and made contact with humans.

ALIEN in a sentence as an ajective

  • The protagonist felt a sense of alienation in the bustling city, far from their rural hometown.
  • The eerie landscape gave the impression of a alien world.
  • The new student’s behavior seemed alien to the rest of the class.
  • His ideas were met with alien reactions from his colleagues.
  • The scientist made a groundbreaking discovery that challenged alien theories.
  • She experienced a sense of alienation after moving to a foreign country.
  • The abandoned house had a alien atmosphere, as if it were from another time.
  • The artist’s work depicted alien landscapes, inviting viewers to explore unfamiliar realms.

Origin of ALIEN

The term “alien” has a rich etymology with roots in Latin and Old French. Here’s a breakdown:

  • Latin Origins: The word “alien” comes from the Latin word “alienus,” which means “belonging to another” or “foreign.” In Latin, “alienus” was used to describe something or someone that was not one’s own or native.
  • Old French Influence: During the Middle Ages, Old French heavily influenced the English language, and the word “alien” was adopted from French. In Old French, “alien” retained its sense of something foreign or belonging to another.
  • Semantic Evolution: Over time, the meaning of “alien” expanded to encompass various connotations, including foreignness, otherness, and unfamiliarity. It came to describe anything or anyone that is not part of one’s own group, society, or culture.

Overall, the etymology of “alien” highlights its origins in Latin and Old French roots, its evolution to encompass notions of foreignness and otherness, and its diverse usage in contemporary English.


  • Foreign
  • Extraterrestrial
  • Otherworldly
  • Strange
  • Unfamiliar
  • Exotic
  • Unknown
  • Outsider


  • Familiar
  • Native
  • Indigenous
  • Local
  • Common
  • Friendly
  • Earthly
  • Resident


  • Alienation
  • Planet
  • Alienated
  • Galaxy
  • UFO
  • Ufology
  • Research
  • Visitor

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