An Etymological Dictionary of the German Language/neben
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neben, adv. and prepos., ‘beside, along with, in addition to,’ from MidHG. nëben, shortened form of enében, OHG. nëben, inében, ‘beside’; as a compound of in and eben it signifies lit. ‘in the same line with,’ similarly AS. on efn, on emn, ‘alongside.’ Comp. the following word.