Etymology
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gigantic (adj.)

1610s, "pertaining to giants," from Latin gigant- stem of gigas "giant" (see giant) + -ic. Replaced earlier gigantine (c. 1600), gigantical (c. 1600), giantlike (1570s). The Latin adjective was giganteus. Of material or immaterial things, actions, etc., "of extraordinary sine or proportions," by 1797.

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Definitions of gigantic

gigantic (adj.)
so exceedingly large or extensive as to suggest a giant or mammoth;
a gigantic redwood
gigantic disappointment
Synonyms: mammoth
From wordnet.princeton.edu