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• n  any four copies; any of four things that correspond to one another exactly
  it was signed in quadruplicate
• v  reproduce fourfold
  quadruplicate the bill
• s  having four units or components

• One is Terry Kilburn, 12-year-old son of a London bus driver, who made a hit as Tiny Tim in last season's Christmas Carol, and who functions in quadruplicate as a four .
• Questionnaires had to be filled out in quadruplicate for each jump.
• Life has become predictable, its Latin impulse governed by ration books, arbitrary government edicts and complex forms to be filled out in quadruplicate.

• quadruple
• quadruplex
• fourfold
• four-fold