isometric UK /ˌaɪ.səʊˈmɛt.ɹɪk/US /ˌaɪ.soʊˈmɛt.ɹɪk/adjective 5noun 1forms 3 adjective5 •Of or exhibiting equality in dimensions. •Being or relating to a geometric system of three equal axes lying at right angles to each other (especially in crystallography). •Of or involving muscular contraction against resistance in which the length of the muscle remains the same. •Of exercises, involving moves and routines that produce such muscular contraction.isometric sets •Of a thermodynamic process, taking place at constant volume because of being confined by rigid boundaries. noun1 •A line connecting isometric points. formsisometrics · more isometric · most isometric