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From The Collaborative International Dictionary of English v.0.48:
Guadalcanal \Guadalcanal\ n. 1. a mountainous island; the largest of the Solomon Islands in the independent state that is a member of the British Commonwealth. [WordNet 1.5] 2. A battle in World War II in the Pacific (1942-1943), in which American forces invaded the island of Guadalcanal, then occupied by Japanese forces; the island was recaptured by American forces after heavy fighting. Syn: battle of Guadalcanal. [WordNet 1.5]