(statistics) an unrestricted variable in a frequency distribution WordNet 3.0 & Open English WordNet

In statistics, the number of degrees of freedom is the number of values in the final calculation of a statistic that are free to vary. Wikipedia

The number of values in the final calculation of a statistic that are free to vary Wikipedia Disambiguation

Number of values in the final calculation of a statistic that are free to vary;number of independent ways by which a dynamic system can move,without violating constraint;minimum number of independent coordinates that specify the position of the syste Wikidata

Any unrestricted variable in a frequency distribution. Wiktionary

Mathematics: unrestricted variable. Wiktionary (translation)