biquarterly
bi·quar·ter·ly
(bī-kwôr′tər-lē)adj.
Happening or appearing two times during each three-month period of a year.
bi·quar′ter·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
biquarterly
(baɪˈkwɔːtəlɪ)adj
occurring twice every three months
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014