Baretti: A dictionary of the English and Italian languages
Sómma, s. f.
1. a sum, amount, quantity. Una — di danari, a sum of money; 2. extremity, top, height, peak; 3. summary; 4. conclusion.La — d'un affare, the main point of a business. Far —, to multiply. Levar la —, to add up. In —, in short, in conclusion.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
somma: a summe of any thing, the end of an accompt, the whole, the principall or totall summe. Also an end, a conclusion, a consummation, a perfection, an issue, or accomplishing of any thing. Also the height, the top or fulnesse of any thing, the principall or chiese point of a matter, a collection of things or words.