to the analyte amount 
. The corresponding graphical display for a single analyte is referred to as the calibration
curve. When extended to additional variables or analytes which occur in multicomponent
analysis, the 'curve' becomes a calibration surface or hypersurface.
Source:
PAC, 1995, 67, 1699
(Nomenclature in evaluation of analytical methods including detection and quantification
capabilities (IUPAC Recommendations 1995))
on page 1703
See also:
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2177