bimonthly adjective 2adverb 2noun 1forms 1 adjective2 •Occurring once every two monthsThe organization's bimonthly meetings allow for two discussions each quarter.His bimonthly appointment was almost due. •Occurring twice every month. adverb2 •Once every two months; bimestrially.The organization's board of directors meets bimonthly. •Twice every month; semimonthly.They checked on his progress bimonthly. noun1 •A publication that is published on a bimonthly basis.We have to get the report done. If the boss doesn't get his bimonthly he'll scream. formsbimonthlies