[bi.lat.er.al] adj (1775) 1: having two sides
2: affecting reciprocally two nations or parties "a ~ treaty" "a ~ trade agreement" 3 a: of, relating to, or affecting the right and left sides of the body or the right and left members of paired organs "~ nephrectomy" b: having bilateral symmetry -- bi.lat.er.al.ism n -- bi.lat.er.al.ly adv