Definition of fluctuatenext
as in to vary
to pass from one form, state, or level to another temperatures will fluctuate between the low and high 50s today

Synonyms & Similar Words

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Antonyms & Near Antonyms

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How does the verb fluctuate differ from other similar words?

Some common synonyms of fluctuate are oscillate, sway, swing, undulate, vibrate, and waver. While all these words mean "to move from one direction to its opposite," fluctuate suggests constant irregular changes of level, intensity, or value.

fluctuating interest rates

When would oscillate be a good substitute for fluctuate?

Although the words oscillate and fluctuate have much in common, oscillate stresses a usually regular alternation of direction.

an oscillating fan

Where would sway be a reasonable alternative to fluctuate?

While in some cases nearly identical to fluctuate, sway implies a slow swinging or teetering movement.

trees swaying in the breeze

When can swing be used instead of fluctuate?

The synonyms swing and fluctuate are sometimes interchangeable, but swing implies a movement of something attached at one end or one side.

the door suddenly swung open

When is it sensible to use undulate instead of fluctuate?

In some situations, the words undulate and fluctuate are roughly equivalent. However, undulate suggests a gentle wavelike motion.

an undulating sea of grass

When might vibrate be a better fit than fluctuate?

While the synonyms vibrate and fluctuate are close in meaning, vibrate suggests the rapid oscillation of an elastic body under stress or impact.

the vibrating strings of a piano

When could waver be used to replace fluctuate?

The words waver and fluctuate can be used in similar contexts, but waver stresses irregular motion suggestive of reeling or tottering.

the exhausted runner wavered before collapsing

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Recent Examples of fluctuate This event created a lot of attention among radio astronomers, who, over the years, found many other bright, rapidly fluctuating sources. Phil Plait, Scientific American, 26 June 2026 Surcharges–a cost added by some airlines into tickets to offset the fluctuating cost of jet fuel–have also impacted American consumers. Tiago Ventura, Time, 26 June 2026 The movement, with an 80-hour power reserve and a frequency of 4 Hz, is also home to a perpetual calendar and an equation of time display, showing the difference between mean solar time, shown on the main dial, and true solar time, which fluctuates due to the Earth’s elliptical orbit. Nicole Hoey, Robb Report, 26 June 2026 The annual average tuition rate fluctuated between $41 and $59, equivalent to between $1,586 and $2,194 today. Thomas Adam, The Conversation, 26 June 2026 See All Example Sentences for fluctuate
Recent Examples of Synonyms for fluctuate
Verb
  • From that glossy start emerges an elaborate, colossal bun composed of braids in varying widths—from pencil-thin plaits woven around the base to chunkier folds making up the lion’s share of the height-enhancing sculpture.
    Marci Robin, Allure, 29 June 2026
  • Pricing is based off of averages, your installation costs will vary by equipment, contractor and location.
    Alora Bopray, USA Today, 29 June 2026
Verb
  • Prices and availability may change.
    Saman Shafiq, USA Today, 25 June 2026
  • But the mood quickly changed when team coach Migné’s name was announced, and the crowd responded with boos.
    Jacqueline Charles, Miami Herald, 25 June 2026
Verb
  • The border shifted and changed hands here at least four times in the 19th century and a fifth time in the 20th, tugged south by war and treaty, peace talks and purchases.
    Lauren Villagran, USA Today, 28 June 2026
  • While shows like these still exist (Dora even got a modern reboot) Gen Alpha has shifted their viewing habits almost entirely online.
    Kara Nesvig, Parents, 28 June 2026

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Cite this Entry

“Fluctuate.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/fluctuate. Accessed 5 Jul. 2026.

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