bimonthly

nouns

a periodical that is published twice a month or every two months (either 24 or 6 issues per year)
bimonthly
is a type of (narrower)
a periodical that appears at scheduled times
serial, serial publication, series

adjectives

occurring twice a month
"a semimonthly publication"
bimonthly, semimonthly
occurring every two months
"bimonthly visits"
bimestrial, bimonthly

adverbs

twice a month
"salaries are paid semimonthly"
bimonthly, semimonthly
every two months
"the bill was payable bimonthly"
bimonthly