- The definition of gargantuan is enormous or gigantic.
A 10-foot high mountain of chocolate bars would be an example of a gargantuan amount of chocolate.
gargantuan 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.
Origin: after Gargantua
gargantuan definition by American Heritage Dictionary
Of immense size, volume, or capacity; gigantic. See Synonyms at enormous.