competitive
competitory
coordinated
duplicate
matching
mated
one-to-one
paired
twin
twinned
adapted
allied
assembled
associated
balanced
banded together
biconjugate
biform
bifurcated
bigeminate
bijugate
bilateral
bipartisan
bipartite
bound
bracketed
collected
conformable
conjoined
conjugate
conjugated
connected
copulate
coupled
dichotomous
double
duadic
dual
dualistic
duplex
duplicated
dyadic
fitted
gathered
hand-in-glove
hand-in-hand
harmonized
identical
incorporated
integrated
intimate
joined
knotted
leagued
linked
married
merged
one
attached
detached
dispatched
hatched
latched
mismatched
overmatched
patched
reattached
scratched
snatched
thatched
unattached
unmatched