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| English | Italian |
| climatic variation | alterazione dei climi |
| genetic variation Change in one or more phenotypic characteristics, due to gene mutation or rearrangement, environmental effects, etc. | variazione genetica |
| period with appreciable variations in radioactive fallout | periodo di forti fluttuazioni delle ricadute radio-attive |
| seasonal variation In time series, that part of the movement which is assigned to the effect of the seasons on the year | variazione stagionale |