Etymograph

English

isometry

Isometry comes from Ancient Greek ἰσομετρία.

  1. Ancient Greekc. 800–300 BCEἰσομετρίαisometría
  2. New Latinc. 1500–1900isometria
  3. Englishtodayisometry

attested reconstructed ? uncertain or disputed

Lineage

  1. Ancient Greekc. 800–300 BCEἰσομετρίαisometría
  2. New Latinc. 1500–1900isometria
  3. Englishtodayisometry

A compound of ἴσος ‘equal’ + μέτρον ‘measurement’ + -ια ‘-y’

Proto-Indo-European *wi- ‘to separate’

Proto-Hellenic *wíswos

Ancient Greek ἴσος ‘equal’

Proto-Indo-European *meh₁- ‘to measure’

Ancient Greek μέτρον ‘measurement’

Today it means

noun 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.

Language periods are conventional ranges, not dates for this word.

Etymograph / Ancient Greek ἰσομετρία / isometry