from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A rich mine, vein, or pocket of ore.
- n. A source of great wealth or prosperity.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In mining, a rich mine or vein of silver or gold.
- n. The point at which two mother lodes intersect
- n. By extension, anything which is a mine of wealth or yields a large income or return.
from the GNU version of the Collaborative International Dictionary of English
- n. In mining, a rich mine or vein of silver or gold; hence, anything which is a mine of wealth or yields a large income.
from The Century Dictionary and Cyclopedia
- n. A term in common use in the Pacific States, signifying a rich mass of ore: opposed to borrasca.
- n. Hence—2. A mine of wealth; a profitable thing; good luck: as, to strike a bonanza.
- Very extensive and profitable. Compare bonanza, n., 2.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a sudden happening that brings good fortune (as a sudden opportunity to make money)
- n. an especially rich vein of precious ore
Spanish, from Medieval Latin bonacia, calm sea, blend of Latin bonus, good and Medieval Latin malacia, calm sea (from Greek malakiā, from malakos, soft.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Spanish bonanza ("calm sea, fair weather, good luck, rich lode"), from Medieval Latin bonacia ("fair weather"), a blend of bonus ("good") and malacia ("calm sea"). (Wiktionary)