the GNU version of the Collaborative International Dictionary of English
adj. Twofold; double; of two kinds, degrees, etc.
The Century Dictionary and Cyclopedia
Twofold; double; of two kinds, degrees, etc.
Word Usage
"Single Fold or Bi Fold Programs - Single fold or sometimes referred to as bifold funeral programs are the the traditional layout and format which is the most widely used today and uses a letter size sheet which folds in half."