The authoritative instrument for the distribution of all forms of official IRS tax guidance is the Internal Revenue Bulletin (IRB), a weekly collection of these and other items of general interest to the tax professional community.
perfidy definition: The definition of a perfidy is a deliberate betrayal. (noun) An example of a perfidy is spreading a best friend's secrets all over town....
WordReference Random House Learner's Dictionary of American English Â© 2016. perâ¢seâ¢cuâ¢tion /ËpÉsÉªËkyuÊÉn/USA pronunciation n. [uncountable] the act or state of persecuting or of being persecuted:suffering persecution for the sake of justice.