American Heritage Dictionary
(5)
Century Dictionary
(1)
GNU Webster's 1913
(2)
WordNet
(5)
Elsewhere on the web
The Government Accounting Office is required to review the spending bimonthly, and today, the investigative arm of Congress asked the public for help fulfilling that role.— Consumer Reports Electronics Blog
Published bimonthly, the Public Affairs Report (PAR) focuses on recent research, current seminars, and news of interest to scholars, journalists, political operatives, public officials, and interested citizens.
Kaiser Health Poll Report uses bimonthly Kaiser surveys to track public opinion about health care topics, including health care priorities for the President and Congress; the public's worries about their own ability to access and pay for health care; and public attention to health-related stories in the news.
Organic Beauty is a bimonthly magazine that is aimed at the ever increasing number of beauty consumers interested in organic and natural cosmetics.— CosmeticsDesign RSS
She also writes a bimonthly career column for Science Magazine's Schizophrenia for Dummies (Wiley, November 2008) with her psychiatrist / husband Jerome Levine,— The Full Feed from HuffingtonPost.com

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You can expect to see this word about twice a year.