semiyearly

sem·i·year·ly

 (sĕm′ē-yîr′lē, sĕm′ī-)
adj.
Issued or occurring twice a year or once every half year.
n. pl. sem·i·year·lies
A semiyearly event or publication.
adv.
Every half year.
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.

semiyearly

(ˌsɛmɪˈjɪəlɪ)
adj
another word for semiannual
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

sem•i•year•ly

(ˌsɛm iˈyɪər li, ˌsɛm aɪ-)

adj. adv.
2. twice a year; semiannually.
[1925–30]
usage: See bi-1.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.