ametria

He defines ignorance (agnoia) as a kind of disproportion (ametria) or ugliness (aischos) of the soul, marked by a failure of the soul to attain its proper end of truth (228c-d); and he defines discord (stasis), a kind of disease (nosos), as "the disagreement (diaphoran) of that which by nature is akin by reason of a certain corruption (tinos diaphthoras)." (20) Now ametria and agnoia (and amathia: lack of learning), as the words themselves suggest, are negative notions, derived in opposition to measure and knowledge.

Disorder is simply lack of order or measure, akosmos or ametria, and as we saw in the Sophist, ametria is relative to metria, measure, as its negation.