equant adjective 1noun 1forms 3 adjective1 •Having comparable measurements in all directions; equidimensional.If all crystallization centers are evenly spaced, the resulting microcrystals will form equant, polyhedral blocks of subuniform size such as those observed with the electron microscope. — 1982 noun1 •(historical) The center of uniform motion of a planetary deferent. formsequants · more equant · most equant