Where does “extraterrestrialness” come from?

extraterrestrialness (English) comes from English extraterrestrial, from English extra-, from Latin extrā, from Latin exter, from Proto-Italic *eksteros.

extraterrestrialness (English): The state or condition of being extraterrestrial

Definitions

  1. The state or condition of being extraterrestrial

Ancestry of “extraterrestrialness”, step by step

extraterrestrialness traces back through two separate lines of ancestry.

via English extraterrestrial

StepLanguageWordMeaning
1EnglishextraterrestrialOriginating from outside of the Earth's...
2Englishextra-Outside of, beyond
3Latinextrāon the outside
4LatinexterOn the outside, outward, external, outer; Of...
5Proto-Italic*eksteros

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Italic *eksterosEvery word from Latin exterEvery word from Latin extrā