1) Bimensal 2) Bimestrial 3) Semimonthly 1) Every two months 2) Exclusively Saxon word 3) Exclusively Anglo word 4) Occurring every two months 5) Occurring twice a month 6) Semimonthly 7) Time unit 8) Twice a month 9) Unit of time 10) Word of purely Anglo origin 11) Word with Anglo-Saxon origins 
• (a.) Occurring, done, or coming, once in two months; as, bimonthly visits; bimonthly publications. • (adv.) Once in two months. • (n.) A bimonthly publication.
Bi·month'ly adjective [ Prefix bi- + monthly .] Occurring, done, or coming, once in two months; as, bimonthly visits; bimonthly publications. -- noun A bimonthly publication. 
A frequency of every two months
[adj] - occurring every two months
Once every two months.
bimestrial adjective occurring every two months; `bimonthly visits`