# 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 ?
We have got a great crosssection of goods; that's one of the things the judges picked up on," said Nigel.
Figures from the Office for National Statistics, which cover a wide crosssection of workers, had wage growth at just 0.
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.
Then it developed into the concept of a controlled portrait of a festival, with some of the crowd, roadies, security, a real crosssection of the weekend.
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.
The considerable number of pictures give both an idea of the terrain involved and a crosssection of the individuals who served there.
Mehdi Hassan sang the compositions of a crosssection of poets but some of his best songs reflected the work of Mir Taqi Mir, Mirza Ghalib and Faiz Ahmed Faiz.
Wehavegotthebesttrainers in England, and a wide crosssection.
The survey was conducted through telephone interviews with a crosssection of emigrants in terms of gender, age, place of origin in Ireland and destination abroad.
It is not one select group trying to protect their interests - a crosssection of Merseyside medics think the proposed legislation will damage the health service beyond repair.

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