noun.
In embryology, the property whereby all the parts of the unsegmented egg are alike capable of giving rise to any portion of the embryonic body: opposed to anisotropy.
noun.
The state or property of being isotropic.
the GNU version of the Collaborative International Dictionary of English
noun.
Uniformity of physical properties in all directions in a body; absence of all kinds of polarity; specifically, equal elasticity in all directions.