Bernard Liengme wrote:
A quote from http://www.askoxford.com/asktheexper...ords/bimonthly
Does bimonthly mean 'twice a month' or 'every two months'?
I'm afraid it means both! But in the publishing industry, it is used fairly
consistently to mean 'every two months'.

..... Which is what I said, I believe. That definition fails to
indicate who uses to mean "twice a month", and how prevalent that
(mis)usage is. Google "define: bimonthly" for some insight.

In any case, even "twice a month" does not match what the OP is
interested in, since "twice a month" would result in dividing the rate
by 24, not 26. So clearly, the OP did not mean "bimonthly", by any
definition.

The same ambiguity affects biweekly and biyearly.
If you want to be absolutely clear, use a phrase such as
'twice a week' or 'every two years'

Agreed.