isometry
Etymology

From nl. isometria, from Ancient Greek ἰσομετρία, from ἰσο- + -μετρία, from ἴσος ("equal") and μέτρον ("measurement") + -ια ("-y").

Noun

isometry (plural isometries)

  1. (mathematics) A function between metric spaces (or on a single metric space) having the property that the distance between two images is equal to the distance between their preimages.
    Isometry is to metric spaces what isomorphism is to groups.
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