aligned
analogous
coextending
coextensive
collateral
comparable
concurrent
correspondent
corresponding
duplicate
equal
equidistant
equispaced
equivalent
even
lined up
matching
nonconvergent
nondivergent
of a kind
of a piece
of a size
parallel
parallelepipedal
parallelinervate
parallelodrome
parallelogrammatic
parallelogrammic
parallelotropic
twin