- Yeah is defined as a way to express yes.
An example of yeah is a teenager agreeing that they will be home for dinner.
yeah definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Informal yes: an affirmative reply
Origin: probably ; from Dutch and amp; German ja, merged with yea
yeah definition by American Heritage Dictionary
Origin: Variant of yea.