Definitions
1.nounA line connecting isometric points.
2.adjectiveOf, or exhibiting equality in dimensions.
3.adjectiveOf, or being a geometric system of three equal axes lying at right angles to each other (especially in crystallography).
4.adjectiveOf or involving muscular contraction against resistance in which the length of the muscle remains the same. See also: Wikipedia:isometric exercise
5.adjective(of a thermodynamic process) Taking place at constant volume because of being confined by rigid boundaries.