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....
PERFIDIOUS Dictionary entry overview: What does perfidious mean? â¢ PERFIDIOUS (adjective) The adjective PERFIDIOUS has 1 sense: 1. tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans Familiarity information: PERFIDIOUS used as an adjective is very rare.