You know what it looks like… but what is it called?
TAKE THE QUIZ“variation of”
The following 2 entries include the term variation of.
variation of latitude
: a small periodic change in the observed latitude of any place resulting from wandering of the poles
variation of parameters
: a method for solving a differential equation by first solving a simpler equation and then generalizing this solution properly so as to satisfy the original equation by treating the arbitrary constants not as constants but as variables
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Merriam-Webster unabridged
