From Wikipedia, the free encyclopedia

CIR may refer to:

• Caledonian Road & Barnsbury railway station, the standard code for this railway station
• Carbon Isotope Ratio analysis, a subset of isotope ratio mass spectrometry
• Carrier-to-Interference Ratio or Signal:Interference ratio, a term used in radio transmission
• Center for Individual Rights, an individual rights protection group
• Central Ischaemic Response, a cause of fainting, see Syncope (medicine)#Causes
• Cold Induced Rhinorrhea, runny nose due to cold
• Command Instrument Rating, a category of aircraft pilot Instrument Rating
• Committed Information Rate, a synonym for minimum guaranteed bitrate in telecommunications
• Committee on International Relations (University of Chicago), a graduate program
• Committee on International Relations, the name of the United States House Committee on Foreign Affairs prior to 2007
• Compagnie Industriali Riunite - CIR Group, an industrial holding company of the De Benedetti Group
• Component Infrastructure Roadmap, a computer systems service-oriented architecture
• Comprehensive Immigration Reform Act of 2006, a US Senate Bill on border security
• Comprehensive Immigration Reform Act of 2007, full name: Secure Borders, Economic Opportunity and Immigration Reform Act, a US Senate Bill
• Computational Image Analysis and Radiology
• Consumer IR, infrared remote control and communication
• Coordinator for International Relations, a position within the JET Programme
• Corotating Interaction Region, the interface between fast and slow regions of the solar wind
• Cosmetic Ingredient Review, a consumer safety group
• Cost:Income Ratio, one of a series of financial ratios
• Cox-Ingersoll-Ross model for interest rate dynamics
• Circinus, written Cir, a standard astronomical abbreviation
• Channel 1 Releasing, an adult film studio
• The Campionato Italiano Rally the official title of the Italian Rally Championship.

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Definition from Wiktionary, a free dictionary

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Noun

Cir

1. Earth (planet).

Declension