plural of space alien

(chiefly US) An extraterrestrial being; a visitor from outer space.

(US, law) A person born outside the United States who has legally established temporary or permanent residence in the United States, but has not become a United States citizen.

plural of resident alien

plural of illegal alien

A small religious house dependent on a large monastery in some other country.

plural of alien priory

(botany) A plant that appears with no apparent human assistance but does not develop a sustained population.

plural of casual alien

(fandom slang) April 26, as a "fan holiday" celebrating the science-fiction horror franchise "Aliens". The date 4/26 is in reference to fictional planet LV-426 where the Xenomorph was first unveiled.