Spanish word meaning to go

Inter-racial, particularly in the Pornography industry.

Informational Revolution, one of the theoretical frameworks within which trends in current society can be conceptualized

International relations, a branch of political science, is the study of foreign affairs of and relations among states within the international system

Information retrieval, the science of searching for information in documents, searching for documents themselves, searching for metadata which describe documents, or searching within databases

Industrial relations (labor relations)

Hebrew word meaning city

Information Resources, sometimes used as an alternative to Information Technology

Ionizing radiation

International Rescue, the fictional organisation featured in Thunderbirds (TV series)

Indian Railways, the state-owned railway company of India

Infrared (electromagnetic radiation)

Infrared spectroscopy

Iridium, The 77th element

Iran Air (IATA airline code IR)

Internal Revenue Service, the United States government agency that collects taxes and enforces the internal revenue laws. The IRS is a bureau of the Department of the Treasury

Insulin resistance

Engineer ("Ir" for Ingénieur), someone who practices the profession of engineering

Integrated Resort, a euphemism for a casino in Singapore

Irish Rail, the national passenger and freight railway system of the Republic of Ireland

Ingersoll-Rand Company Limited (NYSE trading symbol IR)

I. R. Baboon from the cartoon series I am Weasel

Interventional radiology

ImageReady (Adobe), a bitmap graphics editor shipped with Adobe Photoshop by Adobe Systems

Investor relations, a set of activities which relate to the ways in which a company discloses information required for regulatory compliance and good investment judgment to bond and/or shareholders and the wider financial markets

Republican Party of Minnesota, formerly Independent-Republican Party of Minnesota

Institutional research, the collection, analysis, and reporting of institutional data

Institutional repository, an online locus for collecting and preserving - in digital form - the intellectual output of an institution, particularly a research institution

Instrument Rating, refers to the qualifications that a pilot must have in order to fly under Instrument Flight Rules (IFR)

Injured reserve, a special sports reserve list for professional teams to use if a player is injured and unable to play for an extended time

Incident report

Intermediate representation, a computer data structure

International Rectifier Corp., a manufacturer of power semiconductors

Inverted repeat, a sequence of nucleotides that is the reversed complement of another sequence further downstream

In Irish legend, Ir was one of the sons of King Milesius who took part in a semi-legendary invasion of Ireland.

International Rules a hybrid code of football

Iran (country code: IR, Internet domain: .ir)