American Dictionary

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Definition alien in American English

alien adjective

adjective
/ˈeɪliən/
1

from a different country, race, or culture

Example

Under the program, alien workers can enter the U.S.

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2

relating to a planet other than Earth, or involving creatures from a planet other than Earth

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3

completely different from what you usually do, feel, or know

Example

They found the new business environment alien and puzzling.

Example

The concept is totally alien to her.

Synonyms and related words
Definition alien in American English