[adjective], [adverb] [not gradable] - happening or appearing every two months or twice a montha bimonthly publication/reportThe magazine is published bimonthly, with six issues a year.To keep a close check on progress we will have a bimonthly meeting (= a meeting every two weeks) for the next three months.
BIMONTHLY
Meaning of BIMONTHLY in English
Cambridge English vocab. Кембриджский английский словарь. 2012