An Etymological Dictionary of the German Language/mit
mit, prep. and adv., from the equiv. MidHG. and OHG. mit, prep., ‘with,’ and the MidHG. adv. mite, OHG. miti; corresponding to Goth. miþ, mid, adv. and prep., ‘with,’ AS. mid, obsolete in E. (except in midwife). Teut. mid, earlier midi, represents, according to the permutation of consonants, pre-Teut. miti or meti, and hence is allied to Gr. μετὰ, Zend maṭ, ‘with,’ It might also be connected with the cognates discussed under mitz, meaning ‘reciprocal.’