# cross section

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Related to Crosssection: Scattering cross section

## cross section

1. Maths a plane surface formed by cutting across a solid, esp perpendicular to its longest axis
2. a section cut off in this way
3. Physics a measure of the probability that a collision process will result in a particular reaction. It is expressed by the effective area that one participant presents as a target for the other

## Cross Section

in hydraulics, the cross section of a liquid stream (in a pipeline, channel, or river) perpendicular to the direction of the flow velocity. If the liquid motion is continuously changing, the cross section is taken as flat and equal to the cross section area of the flow.

## cross section

[′krȯs ‚sek·shən]
(geology)
A diagram or drawing that shows the downward projection of surficial geology along a vertical plane, for example, a portion of a stream bed drawn at right angles to the mean direction of the flow of the stream.
An actual exposure or cut which reveals geological features.
(graphic arts)
A diagram or drawing representing a cut at right angles to an axis.
(mapping)
A horizontal grid system that is laid out on the ground for determining contours, quantities of earthwork, and so on, by means of elevations of the grid points.
(mathematics)
The intersection of an n-dimensional geometric figure in some euclidean space with a lower dimensional hyperplane.
A right inverse for the projection of a fiber bundle.
(physics)
An area characteristic of a collision reaction between atomic or nuclear particles or systems, such that the number of reactions which occur equals the product of the number of target particles or systems and the number of incident particles or systems which would pass through this area if their velocities were perpendicular to it. Also known as collision cross section.

## cross section

A representation of a building, or portion thereof, drawn as if it were cut vertically to show its interior; often taken at right angles to the longitudinal axis of the building.
References in periodicals archive ?
The International Sport Business Congress, part of IFB 2014, brought together experts from a crosssection of sports, including football, basketball and rugby.
The summit is a day-long forum for individuals and companies, from a crosssection of industries to come together and share their wisdom, ideas, experiences and future aspirations.
There are scout groups, guide groups, preschools, youth clubs, football teams, disability support groups, pensioners' groups and many more, a fantastic crosssection of the community projects striving to make life better in Coventry and Warwickshire.
More than 13 million people stay in the company's hotels each year Shakila Ahmed, from Travelodge, said: "From keys to a Bugatti, Harry Potter's original wand, a micro pig, breast implants to a script from a well-known British soap programme, our customers' left-behinds demonstrate what a crosssection of people stay in our 527 hotels.
But three individuals in a week is no huge crosssection of Britain and, anyway, it's not always a bad thing to give idiot racists a platform.
We want to build a diverse portfolio that represents a true crosssection of the North West economy.
The Tattersalls July sale showed yet again the enduring international appeal of horsesin-training sales at Park Paddocks and by combining the Guineas Breeze Up with a horses-in-training session we will have a sale which will appeal to a wider crosssection of buyers.
CUTTING across party lines, a crosssection of upper caste leaders in Bihar have joined hands to take on chief minister Nitish Kumar on the contentious issue of land reforms.
The lives of a cultural crosssection of Los Angeles residents converge over a turbulent 36 hours.
He must be admired for having the courage to let the PM know that unless he and the party changes to suit the needs of ALL British people, rather than just a crosssection of society, there can be no doubt that Tory leader David Cameron will be heading for No 10.
We believe it is important that our workforce is made up of a true crosssection of the communities we serve.
For example, the Midyear Conference marked the first time that the heads of the IRS's new Large and Mid-Size Business Division industry groups met with a wide crosssection of taxpayers, as the five industry directors moved from industry session to industry session.

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