least common denominator
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
the least common multiple of the denominators of two or more fractions
Used by arrangement with John Wiley & Sons, Inc.
noun Abbr. lcdThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The least common multiple of the denominators of a set of fractions: The least common denominator of 1/3 and 1/4 is 12. Also called lowest common denominator.