The Oxford Thesaurus An A-Z Dictionary of Synonyms - major adj.

1) larger, greater, bigger, main, chief, important: Henderson grabbed the major portion of the credit. 2) vital, important, critical, crucial, principal, foremost, paramount, primary, prime, main, big, biggest, pre-eminent, notable, noteworthy, significant, outstanding, dominant, dominating; serious, grave, worst: The major problem in commercial kitchens is sanitation.