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Bilateralism: Bilateralism is the conduct of political, economic, or cultural relations between two sovereign states. It is in contrast to unilateralism or multilateralism, which is activity by a single state or jointly by multiple states, respectively.
Bilateral filter: A bilateral filter is a non-linear, edge-preserving, and noise-reducing smoothing filter for images. It replaces the intensity of each pixel with a weighted average of intensity values from nearby pixels.
Bilateral cingulotomy: Bilateral cingulotomy is a form of psychosurgery, introduced in 1948 as an alternative to lobotomy. Today it is mainly used in the treatment of depression and obsessive-compulsive disorder.