One is a tag used in several functions to inform the functions that only one object need be considered or only one solution be produced, as opposed to all objects or all ...

WeightingFunction is an option to the functions SetEdgeWeights and SetVertexWeights that tells the functions how to compute edge weights and vertex weights, respectively.

All the functionality in Algebra`Quaternions` is available in the newly created Quaternions Package.

All the functionality in Calculus`VectorAnalysis` is now available through the newly created Vector Analysis Package.

The functionality in Miscellaneous`Audio` is now available through the newly created Audio Package.

All the functionality in NumberTheory`PrimeQ` is now available through the newly created Primality Proving Package.

All the functionality of NumericalMath`SplineFit`is now available in the newly created Splines Package.

All functionality is available in the newly created Hypothesis Testing Package.

All the functionality of Utilities`Notation` is now available in the newly created Notation Package.

TrigToRadicals[expr] converts trigonometric functions to radicals whenever possible in expr.