This comprehensive and authoritative dictionary provides clear definitions of units, prefixes, and styles of weights and measures within the Syst\u00e8me International (SI), as well as traditional, and industry-specific units. It also includes general historical and scientific background, covering the development of the sequential definitions and sizing of units. This new reference work will prove invaluable to professional scientists, engineers, technicians as well as to students and the general user.  \u00b7 Over 1,600 clear and concise entries complete with historical background \u00b7 Covers a broad range of disciplines, including astronomy, electromagnetics, geology, photography, mathematics, meteorology, physics, and temperature \u00b7 Notes on associated terminology \u00b7 Numerous tables, including the geochronologic scale and the equation of time \u00b7 Comprehensive coverage of the whole Syst\u00e8me International