Quadruplicate (adjective)
definition:
having four units or components
example:
"This is a quadruplicate building."
Synonyms
FourfoldQuadruplicate (noun)
definition:
any four copies
example:
"I need this contract to be signed in quadruplicate."
Quadruplicate (verb)
definition:
to reproduce fourfold
example:
"Please quadruplicate the bill."