Time elapsed from the injection of the sample into a chromatography bed to the recording of a specified signal of the detector due to the sample having passed through the bed.
Source: PAC, 2015, 87, 71. (Definitions of terms relating to individual macromolecules, macromolecular assemblies, polymer solutions, and amorphous bulk polymers (IUPAC Recommendations 2014)) on page 113 [Terms] [Paper]