sunspot cycle
noun Astronomy.
the cycle, averaging in duration slightly more than 11 years, in which the frequency of sunspots varies from a maximum to a minimum and back to a maximum again.
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Question 1 of 7
What does “vacillate” mean?
Compare solar cycle.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020