from The Century Dictionary.
- noun Identity of reciprocal relations. Thus, cousins are said to be in a relation of equiparance, because if A is cousin to B, then B is equally cousin to A.
Sorry, no etymologies found.
a _third_ difference, which is that a relation, especially one of equiparance, is no more to one extreme than to the other, whereas action and passion bear themselves differently to the agent and the patient, and to different termini.