ex·tra·ter·res·tri·al 
/ˌɛkstrətəˈrɛstrijəl/ adjective
/ˌɛkstrətəˈrɛstrijəl/ adjective : coming from or existing outside the planet Earth
▪ extraterrestrial life ▪ extraterrestrial beings/intelligence
▪ extraterrestrial life ▪ extraterrestrial beings/intelligence
— extraterrestrial noun, plural extraterrestrials [count]
▪ a movie about an extraterrestrial [=an extraterrestrial being]
▪ a movie about an extraterrestrial [=an extraterrestrial being]
