Definition from macmillandictionary.com
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There is considerable variation in size, method of construction, and design.
It’s an issue around which there is a wide variation of opinion.
There is, of course, variation between individual people and situations.
Research has shown wide variation in the rate that children learn.
These foods are not influenced by seasonal variations.
The spacecraft is specially insulated against extreme variations in temperature.
There are significant variations within these broad groups.
The dessert is a variation on a classic recipe.
There are several variations on this theme, all with advantages and disadvantages.