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....
perÂ·iÂ·neuÂ·riÂ·um. n. pl. perÂ·iÂ·neuÂ·riÂ·a (-noÍorâ²Ä-É, -nyoÍorâ²-). The sheath of connective tissue enclosing a bundle of nerve fibers. [New Latin: peri- + Greek.