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undulation

[ uhn-juh-ley-shuhn, uhn-dyuh-, -duh- ]
/ ˌʌn dʒəˈleɪ ʃən, ˌʌn dyə-, -də- /
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noun

an act of undulating; a wavelike motion.
a wavy form or outline.
one of a series of wavelike bends, curves, or elevations.
Physics.
  1. a wave.
  2. the motion of waves.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Origin of undulation

First recorded in 1640–50; undul(ate) + -ation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for undulation

British Dictionary definitions for undulation

undulation
/ (ˌʌndjʊˈleɪʃən) /

noun

the act or an instance of undulating
any wave or wavelike form, line, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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