Undulation may refer to:
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Undulation of the geoid
The geoid ( ) is the shape that the ocean surface would take under the influence of the gravity of Earth, including gravitational attraction and Earth's rotation, if other influences such as winds and tides were absent. This surface is exten ...
, the separation between the geoid and the reference ellipsoid of the Earth
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Undulation point, a point on a curve where the curvature vanishes but does not change sign
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Undulatory locomotion
Undulatory locomotion is the type of motion characterized by wave-like movement patterns that act to propel an animal forward. Examples of this type of gait include crawling in snakes, or swimming in the lamprey. Although this is typically the ...
, the most primitive of vertebrate locomotor patterns
* In botany, a wave shaped part such as a
leaf
A leaf (: leaves) is a principal appendage of the plant stem, stem of a vascular plant, usually borne laterally above ground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leav ...
*
''Undulation'' (album), a 2021 live album by Sam Rivers
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