say it: bahy-MUHNTH-lee
bimonthly is an adjective, adverb and noun meaning "occurring twice a month". It carries 5 recorded senses.
every two months
“the bill was payable bimonthly”
a periodical that is published twice a month or every two months (either 24 or 6 issues per year)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for bimonthly come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.