- 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.
Origin of gargantuanafter Gargantua
- Of immense size, extent, or quantity. See Synonyms at enormous.
- Of exceedingly great scope or nature: a gargantuan effort.
(comparative more gargantuan, superlative most gargantuan)
From Gargantua, a giant with a very large appetite in Rabelais's The Inestimable Life of Gargantua.