AMERCE, amers'. A verb formed from a for on or at, from L. merces, reward.

1. To inflict a penalty at mercy to punish by a pecuniary penalty, the amount of which is not fixed by law, but left to the discretion or mercy of the court as, the court amerced the criminal in the sum of one hundred dollars.
2. To inflict a pecuniary penalty to punish in general. Milton uses of after amerce "Millions of spirits amerced of heaven " but this use seems to be a poetic license.