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1. Of, or exhibiting equality in dimensions. (

2. Of, or being a geometric system of three equal axes lying at right angles to each other (especially in crystallography). (

3. (Physiology) Of or involving muscular contraction against resistance in which the length of the muscle remains the same. (

4. (Physics, of a thermodynamic process) Taking place at constant volume because of being confined by rigid boundaries. (

5. (In technical or architectural drawing) Incorporating a method of showing projection or perspective in which the three principal dimensions are represented by three axes 120° apart. (Google Dictionary)

6. (Of a transformation) Without change of shape or size. (Google Dictionary)

7. Of, relating to, or characterized by equality of measure; especially relating to or being a crystallographic system characterized by three equal axes at right angles. (

Word origin: Coined from Greek isos “equal” + metron “measure”

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