Chester Alan Arthur ches·te·ra·lanarthur uncommon noun 1. elected Vice President and became 21st President of the United States when Garfield was assassinated (1830-1886) SynonymsArthurChester A. ArthurChester Alan ArthurPresident Arthur Related words Broader terms President of the United States WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.