I tried to reduce that definition for readability: "suzerain noun: internally autonomous vassal state w/ externally dominated foreign affairs." What dictionary

I tried to reduce that definition for readability: "suzerain noun: internally autonomous vassal state w/ externally dominated foreign affairs." What dictionary is your source of truth? I've been using Webster [1] but I feel like there's probably a better option. [1] https://www.merriam-webster.com/ https://www.merriam-webster.com/