Any four copies; any of four things that correspond to one another exactly.

Reproduce fourfold.

Roget 96: multiply by four, quadruplicate, biquadrate^†.   

Having four units or components.

synonyms: four-fold, fourfold, quadruple, quadruplex.

Roget 96: fourfold, four times; quadrable^†, quadrumanous^†, quadruple, quadruplicate, quadrible^†; fourth.    quadrifoliate^†, quadrifoliolate^†, quadrigeminal^†, quadrigeminate^†, quadriplanar^†, quadriserial^†.    ... show more