quadruplicate

having four parts

The small schools might specialize upon the type locally most desirable, the larger might group its triplicate (or quadruplicate) system of sustained and serious courses about a common Library […]

four times over, multiplied by four

[…] Fortune, who delights in making the miner or the lumber-man a quadruplicate millionaire and in "busting" the railroad king.

in quadruplicate: four times over, in four copies

Four times Cupid's debtor I-- / Bankrupt in quadruplicate.

To replicate four times; to make fourfold; to quadruple.