Birotation refers to the rotation of a rigid body about two perpendicular axes. Some synonyms for birotation include biaxial rotation, dual-axis rotation, two-axis rotation, and double rotation. The term biaxial rotation emphasizes the existence of two distinct axes of rotation, while dual-axis rotation highlights that two rotations occur simultaneously. Two-axis rotation is a more straightforward term that describes the direction of the movement, and double rotation is another term that emphasizes the dual nature of the rotation. Synonyms can help provide clarity and precision in scientific or technical communication, as they allow for specific ideas to be expressed without ambiguity.