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Synonyms for Bilateral (same or very similar meaning)

WordNet sense 1 (having identical parts on each side of an axis):
isobilateral, bilaterally symmetric, bilaterally symmetrical

WordNet sense 2 (having similarity in size, shape, and relative position of corresponding parts):
symmetric, symmetrical

WordNet sense 3 (concerning each of two or more persons or things; especially given or done in return):
mutual, reciprocal

WordNet sense 4 (having two sides or parts):
two-sided

WordNet sense 5 (having many parts or sides):
many-sided, multilateral


From the ODE community, based on WordNetadd/edit