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fluctuation

/flʌkt͡ʃuːˈeɪʃən/ noun C2
  1. A motion like that of waves; a moving in this and that direction; an irregular rising and falling. (countable, uncountable) · the fluctuations of the sea
  2. A wavering; unsteadiness. (countable, uncountable) · fluctuations of opinion· fluctuations of prices
  3. In medicine, a wave-like motion or undulation of a fluid in a natural or abnormal cavity (e.g. pus in an abscess), which is felt during palpation or percussion. (countable, uncountable)

Plural fluctuations

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Through meticulously orchestrated captive breeding programs, these facilities actively safeguard vulnerable species whose natural habitats are imperiled by rampant deforestation and climate fluctuations.
The Conundrum of Captivity, p. 1 · C2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.