1.  cross section(n = noun.location) Array - a section created by a plane cutting a solid perpendicular to its longest axis; Array
is a kind of plane section, section
has particulars: profile
Derived form adjective cross-sectional₂

2.  cross section(n = noun.cognition) Array - a sample meant to be representative of a whole population; Array
is a kind of sample
Derived form adjective cross-sectional₁

3.  cross section(n = noun.attribute) Array - (physics) the probability that a particular interaction (as capture or ionization) will take place between particles; measured in barns; Array
is a kind of chance, probability

1.  a flat plane cutting through a three-dimensional object, usually at right angles to the longest axis of the object. [PJC]

2.  any visual representation of a cross section{1}, showing the internal structure of the object in the plane of the cross section; as, the technician prepared a series of MRI cross sections of the skull.
"Different cross sections created by different techniques may show different aspects of internal structure. Thus computerized axial tomography using X-rays shows different structures than are visualized by MRI." [PJC]

3.  a thin slice of an object made by cutting it transversely; as, to view a cross section of a bacterium with an electron microscope after staining the DNA; cross sections were prepared with a microtome. [PJC]

4.  a representative sample of a complex group; as, the town contained a cross section of the American population. [PJC]

5.  a measure of the probability that a nucleus will interact in a specified way with a bombarding particle, expressed as the effective area that the nucleus presents to the particle; -- called also nuclear cross section. [PJC]

   to create one or a series of cross sections{3} by cutting (an object) into thin slices. [PJC]

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