# cross section

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## cross section

also**cross-sec·tion**(krôs′sĕk′shən, krŏs′-)

*n.*

**1.**

**a.**A section formed by a plane cutting through an object, usually at right angles to an axis.

**b.**A piece so cut or a graphic representation of such a piece.

**2.**

*Physics*A quantity, measured in units of barns, used to express the probability of an encounter between particles over a given area in a collision. Also called

*collision cross section*.

**3.**

*Statistics*A sample meant to be representative of a whole population.

**4.**

*Informal*A variety; a diversity.

**cross′-sec′tion·al**

*adj.*

## cross section

*n*

**1.**(Mathematics)

*maths*a plane surface formed by cutting across a solid, esp perpendicular to its longest axis

**2.**(Mathematics) a section cut off in this way

**3.**the act of cutting anything in this way

**4.**a random selection or sample, esp one regarded as representative: a cross section of the public.

**5.**(Surveying)

*surveying*a vertical section of a line of ground at right angles to a survey line

**6.**(General Physics)

*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

**ˌcross-ˈsectional**

*adj*

## cross′ sec`tion

*n.*

**1.**a section made by a plane cutting something transversely, esp. at right angles to the longest axis.

**2.**a representative sample showing all characteristic parts, relationships, etc., of the whole.

**3.**a vertical section of the ground surface taken at right angles to a survey line.

**4.**

*Physics.*a measure of the probability, expressed as the effective area of a given particle, that one particle will interact with another.

**cross′-sec′tion,**

*v.t.*

**cross′-sec′tional,**

*adj.*

ThesaurusAntonymsRelated WordsSynonyms

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Noun | 1. | cross section - a section created by a plane cutting a solid perpendicular to its longest axisprofile - a vertical section of the Earth's crust showing the different horizons or layers plane section, section - (geometry) the area created by a plane cutting through a solid |

2. | cross section - a sample meant to be representative of a whole populationsample - a small part of something intended as representative of the whole statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters | |

3. | cross section - (physics) the probability that a particular interaction (as capture or ionization) will take place between particles; measured in barnsprobability, chance - a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible; "the probability that an unbiased coin will fall with the head up is 0.5" atomic physics, nuclear physics, nucleonics - the branch of physics that studies the internal structure of atomic nuclei |

Translations

**section efficace**

## cross section

*n*(

*Bio*) → sezione

*f*trasversale; (

*of population*) → campione

*m*(rappresentativo) (

*Topography*) → profilo trasversale

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