APA Dictionary of Psychology

adj. denoting or relating to both sides of the body or an organ. For example, bilateral symmetry is the symmetrical arrangement of an organism’s body such that the right and left halves are approximately mirror images of one another; bilateral transfer is the transfer of training or patterns of performance for a skill from one side of the body, where the skill (e.g., handwriting) was originally learned and primarily used, to the other side of the body. —bilaterally adv.