Baretti: A dictionary of the English and Italian languages
Férmo, s. m.
1. convention, treaty, compact, agreement; 2. a thing which is certain.Tenere, avere, per —, to consider as certain, &c. Cane da —, a setting dog. Per —, certainly, assuredly.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English