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Mathematics A surface containing all the straight lines that connect any two points on it.
(noun)
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A flat or level surface.
(noun)
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A level of development, existence, or achievement: scholarship on a high plane.
(noun)
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An airplane or hydroplane.
(noun)
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A supporting surface of an airplane; an airfoil or wing.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.