quadruplicate (n.)
- biquadrate
- biquadratic
- clone
- copy
- counterpart
- ditto
- double
- dupe
- duplicate
- duplication
- facsimile
- hectograph
- manifold
- microfilm
- mimeo
- mimeograph
- model
- quadruple
- repetition
- replica
- replication
- representation
- reproduction
- stat
- trace
- triplicate
