isocephalism

from The Century Dictionary.

• noun Same as isocephaly.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Art) A peculiarity in the design of bas-relief by which the heads of human figures are kept at the same height from the ground, whether the personages are seated, standing, or mounted on horseback; -- called also isokephaleia.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun art A peculiarity in the design of bas relief by which the heads of human figures are kept at the same height from the ground, whether the characters are seated, standing, or mounted.