equality of measure.
Biology. equal growth rates in two parts of a developing organism.
Geography. equality with respect to height above sea level.
Mathematics. a function from one metric space onto a second metric space having the property that the distance between two points in the first space is equal to the distance between the image points in the second space.

Nearby words

  1. isometric exercise,
  2. isometric period of cardiac cycle,
  3. isometric scale,
  4. isometrics,
  5. isometropia,
  6. isomorph,
  7. isomorphic,
  8. isomorphic response,
  9. isomorphism,
  10. isomorphous

Origin of isometry

From the Greek word isometría, dating back to 1940–45. See iso-, -metry Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for isometry



maths rigid motion of a plane or space such that the distance between any two points before and after this motion is unaltered
equality of height above sea level
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for isometry



1941, from Greek isometria "equality of measure," from iso- (see iso-) + metria "a measuring" (see -metry).

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for isometry



Equality of measure.
Equality of elevation above sea level.
A function between two metric spaces (such as two coordinate systems) which preserves distances. A rotation or translation in a plane is an isometry, since the distances between two points on the plane remain the same after the rotation or translation.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.