n. pl. quad·ren·ni·ums or quad·ren·ni·a (kwô-drĕnē-ə) A period of four years. [Latin quadriennium : quadri-, quadri- + annus, year; see at- in the Appendix of Indo-European roots.] |
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.