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Mathematics A line bounding a plane figure.
(noun)
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Mathematics A surface bounding a solid figure.
(noun)
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A surface of an object, especially a surface joining a top and bottom: the four sides of a box.
(noun)
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A surface of an object that extends more or less perpendicularly from an observer standing in front: the side of the ship.
(noun)
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Either of the two surfaces of a flat object: the front side of a piece of paper; the two sides of a record.
(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.