Definitions for "Absolute configuration"
The configuration of 4 different substituents on an asymmetric carbon. The configuration is expressed relative to D- or L-glyceraldehyde.
An absolute configuration in stereochemistry is the spatial arrangement of the atoms of a chiral molecular entity (or group) and its stereochemical description e.g. R or S IUPAC Gold Bookhttp://www.iupac.org/goldbook/A00020.pdf Link .