'almighty' originates from Old English, specifically the word 'ælmihhtig,' where 'æl-' meant 'all' and 'mihhtig' meant 'mighty.'

'ælmihhtig' transformed into the Middle English word 'almyghti,' and eventually became the modern English word 'almighty'.

Initially, it meant 'all-powerful,' and this meaning has largely remained the same in modern usage.