1 of equal measure.
2 Physiol. (of muscle action) developing tension while the muscle is prevented from contracting.
3 (of a drawing etc.) with the plane of projection at equal angles to the three principal axes of the object shown.
4 Math. (of a transformation) without change of shape or size.
Derivatives:
isometrically adv. isometry n. (in sense 4).
Etymology: Gk isometria equality of measure (as ISO-, -METRY)
Useful english dictionary. 2012.