Definition of "quadrennial" []

• Happening once in four years. (adjective)
• Lasting for four years. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "After all, they don't call our quadrennial presidential election cycles "the silly season" for nothing."
• "The administration hasn't finished a mandatory comprehensive study of U.S. nuclear-arms policy or a broader study of defense, known as the quadrennial review."
• ""Given that it is a so-called quadrennial year with all these events, the advertising sector should be having a really big year," he said."