akin, aligned, alike, analogical, answering, coequal, coextending, coextensive, collatable, collateral, commensurable, commensurate, comparable, comparative, complemental, complementary, concurrent, consonant, convertible, correlative, correspondent, corresponding, duplicate, equal, equidistant, equipollent, equispaced, equivalent, even, homologous, interchangeable, kindred, lined up, matchable, matching, much at one, nonconvergent, nondivergent, of a kind, of a piece, of a size, parallel, parallelepipedal, parallelinervate, paralleling, parallelodrome, parallelogrammatic, parallelogrammic, parallelotropic, reciprocal, reciprocative, relative, similar, tantamount, twin, undifferentiated, uniform