1. bilateral, isobilateral, bilaterally symmetrical, bilaterally symmetric, symmetrical (vs. asymmetrical), symmetric

usage: having identical parts on each side of an axis

2. bilateral, reciprocal (vs. nonreciprocal), mutual

usage: affecting or undertaken by two parties; "a bilateral agreement between the United States and Japan"

3. bilateral, two-sided, multilateral (vs. unilateral), many-sided

usage: having two sides or parts

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See also: bilateral (Dictionary)