'isometry' definitions:

Definition of 'isometry'

(from WordNet)
noun
The growth rates in different parts of a growing organism are the same
noun
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"
noun
Equality of elevation above sea level
noun
Equality of measure (e.g., equality of height above sea level or equality of loudness etc.)