undulation

[uhn-juh-ley-shuh n, uhn-dyuh-, -duh-] /ˌʌn dʒəˈleɪ ʃən, ˌʌn dyə-, -də-/
noun
1.
an act of undulating; a wavelike motion.
2.
a wavy form or outline.
3.
one of a series of wavelike bends, curves, or elevations.
4.
Physics.
  1. a wave.
  2. the motion of waves.
Origin
1640-50; undul(ate) + -ation
Examples from the web for undulation
  • The top edge is a triumph of undulation and its handle a swirl of curling leaves and clever loops.
  • She demonstrated a snakelike undulation of the arms and upper body called the cobra.
  • He must be always on his guard and devote every minute and module of life to the decoding of the undulation of things.
British Dictionary definitions for undulation

undulation

/ˌʌndjʊˈleɪʃən/
noun
1.
the act or an instance of undulating
2.
any wave or wavelike form, line, etc
Word Origin and History for undulation
n.

1640s, from Medieval Latin *undulatio, from Late Latin undulatus "wavy, undulated," from undula "wavelet," diminutive of Latin unda "wave" (see water).