multiple
Photostat
Xerox
biquadrate
biquadratic
clone
copy
counterpart
ditto
double
dupe
duplicate
duplication
facsimile
fourfold
hectograph
make four
manifold
microcopy
microfilm
mimeo
mimeograph
model
multigraph
multiply by four
quadrable
quadrigeminal
quadruple
quadruplex
reduplicate
repetition
replica
replicate
replication
representation
reproduce
reproduction
stat
tetraploid
trace
transcribe
triplicate
quadruplicated
quadruplicates
quadruplicating