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sunspot cycle
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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.
QUIZ
TAKE JOY IN ACING THIS QUIZ ON “PRIDE” SYNONYMS
Hold your head up high as you embark on this quiz that explores some of the synonyms and meanings of “pride.”
Question 1 of 7
What does "dignity" mean?
Compare solar cycle.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022