Etymology
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cross-section (n.)

"section of something made by a plane passing through it at a right angle to one of its axes," 1748, originally in engineering sketches, from cross (adj.) + section (n.). Figurative sense of "representative sample" is by 1903.

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Definitions of cross-section

cross-section (adj.)
representing a plane made by cutting across something at right angles to its length;
cross-section views of the neck
Synonyms: cross-sectional
From wordnet.princeton.edu