Synonyms for again

anew, afresh, newly, once more, once again, repeatedly, over, over and over, from the beginning, again and again, on and on, encore, another time, bis, over again, a second time, anon, freshly, de novo (Latin), da capo (Italian), reiteratively, recurrently, ditto*, repeat*.

Antonyms once*, once only, at first.

doubled, twice as much, multiplied; see double.