# 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 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

## 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.