Definition

1. Noun:
   • A board of the British government: "Ir" (capitalized as "IR") is an abbreviation for the Inland Revenue, a former department of the British government responsible for administering and collecting major direct taxes like income tax.
   • A chemical element: "Ir" is the chemical symbol for iridium, a heavy, brittle, metallic element of the platinum group, used in alloys and found naturally with platinum or osmium.

Usage Examples

• Noun (Government):

  • The form must be submitted to the IR. (The form must be submitted to the Inland Revenue.)
  • He received a notice from the IR about his tax return. (He received a notice from the Inland Revenue about his tax return.)

• Noun (Chemistry):

  • The catalyst contains a small amount of Ir. (The catalyst contains a small amount of iridium.)
  • Iridium (Ir) is one of the densest elements. (Iridium (Ir) is one of the densest elements.)

Advanced Usage

• "IR" as an initialism: In various professional fields, "IR" can stand for other terms, such as "Infrared" in physics, "Investor Relations" in business, or "International Relations" in politics. The meaning is determined by context.
  • The remote control uses an IR signal. (The remote control uses an infrared signal.)
  • She works in the IR department of the corporation. (She works in the Investor Relations department of the corporation.)

Variants and Related Words

• Inland Revenue (proper noun): The full name of the former British tax authority, now part of HM Revenue and Customs (HMRC).
• Iridium (noun): The full name of the chemical element with the symbol Ir.

Synonyms

• For the government body: Tax authority, revenue service.
• For the element: (None, as it is a specific element's symbol)

Related Phrases

• IR spectrum: A common phrase in science referring to the infrared spectrum.
  • The compound was identified by its IR spectrum. (The compound was identified by its infrared spectrum.)

Noun

1. a board of the British government that administers and collects major direct taxes
2. a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium