Definition of COMMODITY RATE. : a common carrier rate distinguished from a class rate and applicable only to a specific commodity or group of related commodities carried between specific points or territories. ADVERTISEMENT. a common carrier rate distinguished from a class rate and applicable only to a specific commodity or group of related commodities carried between specific points or territories.
Cubic Zirconia. Cubic zirconia (CZ), a diamond simulant, is not only the oldest diamond substitute, but also the most popular. Composed of zirconium oxide (ZrO 2) the mineral is extremely rare in natural form. Discovered by German mineralogists in 1937, zirconium wasnât considered economically feasible.ubic zirconia possesses less brilliance (less sparkle), but has more fire (flashes of rainbow color.) CZ is also very hard, not quite as hard as a diamond, but like a diamond can scratch glass.
Axis of symmetry. This is a line about which a shape is symmetrical. That is, the shape on one side of the line is a mirror image of the shape on the other. The shape could be the graph of a function or a physical object. On the left below we can see that a parabola (graph of y=ax2+bx+c) has a vertical line of symmetry running through its vertex. On the right, a photo of a face has an axis of symmetry down the center.