adj.
- belonging to a foreign country.
▸(of a plant or animal species) introduced from another country and later naturalized.
- unfamiliar and distasteful.
- relating to or denoting beings from other worlds.
n.
- a foreigner, especially one who is not a naturalized citizen of the country where they are living.
▸an alien plant or animal species.
- a being from another world.
Derivative
Etymology
ME: via OFr. from L. alienus ‘belonging to another’, from alius ‘other’.