noun, plural bi·month·lies.
Examples from the Web for bimonthly
The situation is the same with “bimonthly,” which can mean “twice a month” and “every two months.”‘New York’ Mag & the Cruel Double Meaning of ‘Biweekly’|Jesse Sheidlower|December 2, 2013|DAILY BEAST
Bimonthly, bī-munth′li, adj. once in two months; also twice a month.
Bimensal, bī-mens′al, adj. happening once in two months: bimonthly.
Sessions for the trial of grave criminal cases are held monthly, bimonthly, or quarterly, according to circumstances.Rambles and Recollections of an Indian Official|William Sleeman