/uy som"i tree/ , n.
1. equality of measure.
2. Biol. equal growth rates in two parts of a developing organism.
3. Geog. equality with respect to height above sea level.
4. Math. 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.
[ 1940-45; isometría. See ISO-, -METRY ]