köken: From Middle High German almehtec, from Old High German almahtīg, alamahtīg, from Proto-West Germanic *alamahtīg, from Proto-Germanic *alamahtīgaz. Equivalent to all (“all”) + -mächtig (“mighty”). Synchronically also analyzable as Allmacht (“omnipotence”) + -ig, although Allmacht in fact represents a back-formation from the adjective. Cognates include Dutch almachtig, English almighty, and Old…
From Middle Dutch almechtich, from Old Dutch *alamahtīg (debatably attested in the Old Saxon Baptismal Vow, the linguistic classification of which is unclear and which contains Old Dutch features), from Proto-Germanic *alamahtīgaz. By surface analysis, almacht + -ig, although in fact almacht is a back-formation from the adjective; alternatively may be interpreted as al- + machtig.