double

Synonyms: as much again bifold binary binate coupled dual dualistic duple duplex duplicate duplicated geminate paired repeated second twice twin twofold two times

Antonyms: single

Synonyms: angel clone companion coordinate copy counterpart dead ringer duplicate image impersonator lookalike match mate picture portrait reciprocal replica ringer simulacrum spitting image stand-in twin

Synonyms: amplify augment dualize dupe duplicate duplify enlarge fold grow increase infold loop magnify multiply plait pleat plicate redouble repeat replicate supplement

Antonyms: disect divide halve