alien

a|li|en1 [ `eıliən ] noun count **

1. ) someone who is not a citizen of the country they are living in:

illegal aliens

2. ) a person or creature from a planet other than Earth

alien

a|li|en 2 [ `eıliən ] adjective *

1. ) only before noun from a different country, race, or culture:

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

2. ) only before noun relating to a planet other than Earth, or involving creatures from a planet other than Earth

3. ) completely different from what you usually do, feel, or know: STRANGE:

They found the new business environment alien and puzzling.

alien to: The concept is totally alien to her.