“The geometry, pattern or form of motion with respect to time” (Basic Biomechanics, Susan J Hall, 5th Ed.)
“The shape, form, pattern and sequencing of linear movement through time, without particular reference to the forces that cause or result from the motion”
Related to angular motion or rotational motion around an axis. This is especially important in the study of human movement, as most human movement involves the rotation of body segments around joints at which they articulate. Even translational movement such as GAIT consists of rotational motions at the hip, knee and ankle.