Quarter.
At every Quarter of the financial year (every 3 months).
The word you may be looking for is "trade" or "barter," perhaps even "exchange."
The word profitable speaks to monetary gain, which is profit. Here's your sentence: The enterprise was not profitable in the first few months, but as the word got out, the customers came in. The two women worked hard to build the business, and their enterprise was operating in the black in two months.
catapult
renounce
A decreased amount of something.
According to the online Oxford Dictionaries, "bimonthly" can refer to something occurring every two months or twice in one month. It might be best to just say "every two months" to avoid confusion.
Quarterly
The word is "Biennial".
Something that happens every three years is a triennialevent.
we have a semiannual banquet for our club that happens every 6 months
Something that happens every six years is sexennial.
If something happens twice a month it is called biweekly because it happens every other week and a month has 4 weeks. there is also bimonthly which is every other month but not really a direct word for something that happens twice a month.
Biennial or biannual can refer to something which happens every two years.
Quinquennial = something that happens every 5 years. Lustral = also something that happens every 5 years or we could invent: semi-Decennial: where semi is half and Deccennial happens every 10 years.
Annual
The definition of the word quotidian is something that happens every single day. A good sentence is, he has to deal with the quotidian traffic on his way to work again.
bimonthly