Bonanza definition, a rich mass of ore, as found in mining. See more. a situation which creates a sudden increase in wealth, go Meaning, pronunciation, example sentences, and more from Oxford Dictionaries. A rich mine, vein, or pocket of ore. 2. A source of great wealth or prosperity. [ Spanish, from Medieval Latin bonacia, calm sea, blend of Latin bonus, good; see. Puzzle bu Now this time on TV you have " Bonanza ," don't forget, you have "Gunsmoke," you have "Andy Griffith," you have domestic shows all about comfort. One goose, two geese. I know a guy that goes to Bonanza. It is in fact a real word but that doesn't mean you should use it. Britney was partying so hard last night, she stripped infront of toddlers.