Longman Dictionary of Contemporary English homepage

cross-section

 noun
     
cross-section [countable]
1 something that has been cut in half so that you can look at the inside, or a drawing of this
cross-section of
a cross-section of a plant stem
in cross-section
The roof beams were 50 centimetres square in cross-section.
2 a group of people or things that is typical of a much larger group [↪ sample]
cross-section of
a wide cross-section of the taxpaying population
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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