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WordNet (r) 3.0 (2006) (WordNet)

isometry
n 1: the growth rates in different parts of a growing organism
are the same
2: a one-to-one mapping of one metric space into another metric
space that preserves the distances between each pair of
points; "the isometries of the cube"
3: equality of elevation above sea level
4: equality of measure (e.g., equality of height above sea level
or equality of loudness etc.)