noun
- A heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium.
- synonyms: iridium, Ir, atomic number 77
- A board of the British government that administers and collects major direct taxes.
- synonyms: Inland Revenue, IR
- The bureau of the Treasury Department responsible for tax collections.
- synonyms: Internal Revenue Service
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). IRS. Retrieved September 20, 2026, from http://smartdefine.org/irs/definitions/1287695 |
| Chicago | WordNet. 2010. "IRS" http://smartdefine.org/irs/definitions/1287695 (accessed September 20, 2026). |
| Harvard | WordNet 2010, IRS, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/irs/definitions/1287695>. |
| MLA | WordNet. "IRS" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/irs/definitions/1287695> |