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The definition of a dinner jacket is a formal jacket or a tuxedo jacket.
An example of a dinner jacket is what a man might wear to a formal affair such as a dinner dance or his wedding.
A young man in a dinner jacket.Licensed from iStockPhoto
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.