power law noun1 •A mathematical relationship in which the magnitude of something is proportional to a fixed power of the magnitude of something else (i.e. the relationship takes the form f(x)=axᵏ).the death toll from a large number of small civil wars is lower than that from a few big interstate wars, to say nothing of world wars, consistent with the power-law distribution of deadly quarrels. — 2011 formspower laws