How to Spell again

Middle English ayen, ayein, ayan, ageyn, again "back, in the opposite direction, to a former state, once more, another time," going back to Old English ongeagn, ongeæn, ongēan, ongān, ongegn, ongēn, agēn (Northumbrian ongægn, ongǣn), (compare parallel compounds in Old Saxon angegin "once more, toward," Old High German ingagan, ingegin "in opposition") from on-, a- on:1, a-:1 + -geagn (going back to Germanic *gagna-, whence Old High German gagan "towards, against," Old Norse gagn- "against, counter, through") or -gegn (going back to Germanic *gagni-, whence Old Saxon & Old High German gegin "against," Old Frisian jēn, Old Norse gegn)