gigantic; enormous; colossal: a gargantuan task.

1585–95; Gargantu(a) + -an

huge, mammoth, immense, vast, elephantine. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gargantuan (ɡɑːˈɡæntjʊən)
(sometimes capital) huge; enormous
usage  Some people think that gargantuan should only be used to describe things connected with food: a gargantuan meal; his gargantuan appetite

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1596, from Gargantua, large-mouthed giant in Rabelais' novels, supposedly from Sp./Port. garganta "gullet, throat," which is from the same imitative root as gargle.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It is a vast, colossal, gargantuan improvement over messing around with pouring batches of hot liquid into a blender.
AT the gargantuan scale of ground zero, every dimension counts.
The gargantuan cruise ships plying the waters hire nearly a thousand workers-on
  each vessel.
Scientists had thought that the animal evolved its bizarre proportions as it
  grew to its gargantuan stature.
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