enormous, immense, huge, vast, gigantic, colossal, mammoth mean exceedingly large. enormous and immense both suggest an exceeding of all ordinary bounds in size or amount or degree, …

1. Exceedingly large in size, extent, or amount, especially for its kind: a gigantic toadstool. See Synonyms at enormous. 2. Very great in scope or importance: a gigantic mistake.

Add to word list extremely large: a gigantic shopping center (Definition of gigantic from the Cambridge Academic Content Dictionary © Cambridge University Press)

If you describe something as gigantic, you are emphasizing that it is extremely large in size, amount, or degree.

Definition of gigantic adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Dec 14, 2025 · gigantic (comparative more gigantic, superlative most gigantic) Very large. quotations

There are three meanings listed in OED's entry for the adjective gigantic, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.