cross sec·tion
noun
a surface or shape that is or would be exposed by making a straight cut through something, especially at right angles to an axis.
"the cross section of an octahedron is a square"
verb
make a cross section of (something).
"complex triangular terrain models for contour cross-sectioning"
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Cross section
Geometry
In geometry and science, a cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher-dimensional spaces. Cutting an object into slices creates many parallel cross-sections. Wikipedia
The meaning of CROSS SECTION is a cutting or piece of something cut off at right angles to an axis; also : a representation of such a cutting.
a small group which represents all of the different types within the total group: The study examined data from 4,100 adults representing a cross ...