adj. 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. [From Latin gigās, gigant-, giant; see GIANT, or from Greek gigantikos (from gigās, gigant-, giant).] gi·ganti·cal·ly adv. |
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