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plane |
Also found in: Dictionary/thesaurus, Medical, Idioms, Wikipedia, Hutchinson | 0.01 sec. |
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plane, in mathematics, flat surface of infinite extent but no thickness. An example of a plane, or more exactly of a bounded portion of a plane, is the surface forming one face, or side, of a cube. A plane is determined, or defined, by any of the following: (1) three points not in a straight line; (2) a straight line and a point not on the line; (3) two intersecting lines; or (4) two parallel lines. Two straight lines in space do not usually lie in the same plane. For a given plane in space, a line can either lie outside and parallel to it, intersect the plane in a single point, or lie entirely in the plane; if more than one point of a straight line lies in the plane, then the entire line must lie in the plane. plane1 1. Maths a flat surface in which a straight line joining any two of its points lies entirely on that surface 2. a. short for aeroplane b. a wing or supporting surface of an aircraft or hydroplane 3. Maths (of a curve, figure, etc.) lying entirely in one plane plane2 1. a tool with an adjustable sharpened steel blade set obliquely in a wooden or iron body, for levelling or smoothing timber surfaces, cutting mouldings or grooves, etc. 2. a flat tool, usually metal, for smoothing the surface of clay or plaster in a mould How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| ? Mentioned in | ? References in classic literature | |
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In the case of the line, this common boundary is the point; in the case of the plane, it is the line: for the parts of the plane have also a common boundary. In this scrap-book is such testimony relating to my shady side, as I have within the past ten years been able to cut from the columns of my competitors in the business of elevating humanity to a higher plane of mind and morals - my 'loathsome contemporaries. The speaker, and the schoolmaster, and the third grown person present, all backed a little, and swept with their eyes the inclined plane of little vessels then and there arranged in order, ready to have imperial gallons of facts poured into them until they were full to the brim. |
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