mutual
reciprocal
related
related to
accessory
accompanying
affinitive
agnate
akin
allied
analogical
analogous
appertaining
associated
associative
attendant
attending
cognate
coincident
collatable
collateral
combined
commensurable
commensurate
comparable
comparative
concomitant
concurrent
congeneric
congenerous
congenial
conjoint
connate
connatural
connected
connective
conspecific
corelated
corelational
corelative
correlated
correlational
coupled
en rapport
enate
fellow
joined
joint
linking
matchable
much at one
paired
variable
variable quantity
Trinitarian
clear
complementary
contractual
copulative
dualistic
fiduciary
hard-and-fast
language
sericultural