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1a surface or shape exposed by making a straight cut through something, especially at right angles to an axis: the cross section of an octahedron is a square in cross section the sailfish’s body looks like a tapering spear
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a thin strip of tissue or other material removed by making two straight parallel cuts through it.
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2a typical or representative sample of a larger group: a cross section of our senior managers
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3 Physics a quantity having the dimensions of an area which expresses the probability of a given interaction between particles.
