"Bilateral" refers to something that involves two sides or parties. In various contexts, such as politics or trade, it often describes agreements or relationships between two countries, like United States and Canada. These interactions can include treaties, trade deals, or diplomatic discussions that benefit both parties. In anatomy, "bilateral" describes structures that are symmetrical and occur on both sides of the body, such as arms and legs. This term helps in understanding the organization of living organisms, emphasizing the importance of symmetry in biological functions and development.