1 another time; once more.
2 as in a previous position or condition (back again; home again; quite well again).
3 in addition (as much again; half as many again).
4 further, besides (again, what about the children?).
5 on the other hand (I might, and again I might not).
Phrases and idioms:
again and again repeatedly.
Etymology: orig. a northern form of ME ayen etc., f. OE ongean, ongaeliggn, etc., f. Gmc
Useful english dictionary. 2012.