English
almightiness
From almighty + -ness.
A compound of almighty + -ness
Proto-Germanic *alamahtīgaz
Proto-West Germanic *alamahtīg
Old English ælmihtiġ ‘all-powerful’
Middle English almyghty
English almighty
Today it means
noun The state or quality of being almighty.
Language periods are conventional ranges, not dates for this word.
Etymograph / almightiness