Exceedingly large of its kind: a gigantic toadstool. (adjective)
Very large or extensive: a gigantic corporation. See Synonyms at enormous.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "gigantic" in a sentence
"The Osages are so tall and robust as almost to warrant the application of the term gigantic: few of them appear to be under six feet, and many are above it."
"In like manner the commander of Fort Casimir, when he found his martial spirit waxing too hot within him, would sally forth into the fields and lay about him most lustily with his sabre; decapitating cabbages by platoons; hewing down lofty sunflowers, which he termed gigantic Swedes; and if, perchance, he espied a colony of big-bellied pumpkins quietly basking in the sun, "Ah! caitiff Yankees!" would he roar, "have I caught ye at last?""
"For at such times, when he found his martial spirit waxing hot within him, he would prudently sally forth into the fields, and lugging out his trusty sabre, of full two flemish ells in length, would lay about him most lustily, decapitating cabbages by platoons — hewing down whole phalanxes of sunflowers, which he termed gigantic"