Entry 2 senses · 2 variants Webster, 1913 bimonthly /bīm-ŭn'-thlē/ · bi·month·ly · IPA /baɪmˈʌnθliː/ a. adv. 01 a. Occurring, done, or coming, once in two months; as, bimonthly visits; bimonthly publications. 1. Occurring, done, or coming, once in two months; as, bimonthly visits; bimonthly publications. 02 adv. Once in two months. 1. Once in two months.