EVISA is providing a list of terms used in the area of speciation and
fractionation analysis as a searchable
glossary. Since speciation analysis is a field of
analytical chemistry that is specified by a pronounced interdisciplinary
cooperation between different sciences such as biochemistry, medicine,
biology, environmental sciences, nutritional sciences and material
sciences its terminology is a complex mixture of terms used in all
these.
In case that you cannot find a term related to mass spectrometry within EVISA's glossary, you may consult more special
glossaries or handbooks about the terminology of mass spectrometry:
Glossaries and web-based resources
IUPAC: IUPAC is the source for definitions of terms to be used in mass spectrometry. Provisional versions of the IUPAC list can be found on the worldwide web e.g.
http://old.iupac.org/reports/provisional/abstract06/murray_prs.pdf, but the definitive text is still not published.
Mass Spec Terms Project/ MS Terms Wiki
SpectroscopyNow: Mass Spectrometry Glossary
Books and other publications related to MS terminology
Anthony Mallet, Steve Down,
Dictionary of Mass Spectrometry, John Wiley & Sons, 2010

K.K. Murray,
Glossary of Terms for Separations Coupled to Mass Spectrometry, J. Chromatogr. A, 1217 (2010) 3922.
doi: 10.1016/j.chroma.2010.03.013
K.L. Busch,
Acronyms in Mass Spectrometry, Spectroscopy, 19 (2004) 40-44.

K.L. Busch,
A Glossary for Mass Spectrometry,
Spectroscopy, 17 (2002) S26-S34.

K.L. Busch,
Units in Mass Spectrometry,
Spectroscopy, 16 (2001) 28-31.

J.F.J. Todd,
Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vaccun technology), Int. J. Mass. Spectrom., 142/2 (1995) 209-240

J.F.J. Todd,
Recommendations for nomenclature and symbolism for mass
spectroscopy (including an appendix of terms used in vaccun technology),
Pure Appl. Chem., 63/10 (1991) 1541-1566.
P. Price,
Standard Definitions of Terms Relating to Mass Spectrometry : A report from the Committee on Measurements and Standards of the American Society for Mass Spectrometry, J. Am. Soc. Mass Spectrom., 2 (1991) 336-48.
doi: 10.1016/1044-0305(91)80025-3
J.H. Beynon, Recommendations for Symbolism and Nomenclature for Mass Spectroscopy,
Pure Appl. Chem, 50/1 (1978) 65-73