Undulation

Undulation may refer to:


 * Undulation of the geoid, the separation between the geoid and the reference ellipsoid of the Earth
 * Undulation point, a point on a curve where the curvature vanishes but does not change sign
 * Undulatory locomotion, the most primitive of vertebrate locomotor patterns
 * In botany, a wave shaped part such as a leaf
 * Undulation (album), a 2021 live album by Sam Rivers