Baretti: A dictionary of the English and Italian languages
Signoreggiá-re, v. n. to domineer, rule, govern, bear rule or sway, to be lord and master, to have the mastery; v. a. to command, be above, overlook. Un balcone che signoreggia una corte, a balcony that overlooks a yard. Un monte che signoreggia una città, a hill that commands a town. Le piogge hanno signoreggiato quest'anno, there has been much rain this year; s. m. Signoreggiá-tóre, f. Signoreggiá-tríce; adj. Signoreggiá-nte.
Florio: a worlde of wordes, or most copious, dictionarie in Italian and English
signoreggiare: to sway, torule, to gouerne or command as a Lord and Master.