The state, quality, or condition of being almighty; supreme power or all-powerfulness.
From almighty plus the noun-forming suffix '-ness,' which converts adjectives into abstract nouns representing qualities. This is one of English's most productive word-formation patterns.
The suffix '-ness' is so powerful in English that speakers can attach it to almost any adjective to create a noun—'almightiness,' 'greyness,' 'bewilderedness'—allowing us to infinitely expand our vocabulary by naming qualities that adjectives describe.
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