I - Abbreviations list
 i
incisor | interest | intransitive | island | isle | the imaginary number √-1
 I
electric current | Imperial | (single column) inch | incumbent | independence | Independent | Inspector | Institute | instructor | intelligence | International | interpreter | iodine | ionization potential | Island | Isle | isospin | issue | moment of inertia | a particular affirmative categorical statement | unit matrix
 IA
Iowa
 IAA
indoleacetic acid | International Advertising Association
 IAAF
International Amateur Athletic Federation
 IAB
Industrial Advisory Board | Industrial Arbitration Board | Internet Activities Board
 IAC
in any case
 IAE
in any event
 IAEA
International Atomic Energy Agency
 IAF
Indian Air Force
 IAM
Institute of Administrative Management | Institute of Advanced Motorists | intermediate-access memory | internal auditory meatus
 IANA
Internet Assigned Numbers Authority
 IAP
Internet access provider
 IAR
instruction address register
 IARC
International Agency for Research on Cancer
 IAS
image analysis system | immediate-access store | Indian Administrative Service | indicated air speed | instalment activity statement
 IASC
International Accounting Standards Committee
 IATA
International Air Transport Association
 IAU
International Association of Universities | International Astronomical Union
 IAW
in accordance with
 IB
in bond | incendiary bomb | industrial business | International Baccalaureate | investment bank | invoice book
 ib.
ibidem
 IBA
Independent Broadcasting Authority | indolebutyric acid | International Bar Association | Investment Bankers’ Association
 IBD
inflammatory bowel disease | ion-beam deposition
 IBF
International Boxing Federation
 IBG
interblock gap
 ibid.
ibidem
 IBO
institutional buyout
 IBR
Inter Bank Rate
 IBRD
International Bank for Reconstruction and Development
 IBS
irritable bowel syndrome
 IC
integrated circuit
 i/c
in charge | in command
 ICA
Institute of Chartered Accountants | Institute of Contemporary Arts | International Coffee Agreement | International Commodity Agreement | International Cooperation Administration
 ICAC
Independent Commission Against Corruption
 ICAEW
Institute of Chartered Accountants in England and Wales
 ICAI
Institute of Chartered Accountants in Ireland
 ICANZ
Institute of Chartered Accountants of New Zealand
 ICAO
International Civil Aviation Organization
 ICAS
Institute of Chartered Accountants of Scotland
 ICBM
intercontinental ballistic missile
 ICC
International Chamber of Commerce | International Criminal Court | Interstate Commerce Commission
 ICCH
International Commodities Clearing House
 ICE
ice, compress, elevation | Institution of Civil Engineers | internal-combustion engine | International Cultural Exchange
 ICFC
Industrial and Commercial Finance Corporation
 ICFTU
International Confederation of Free Trade Unions
 IChemE
Institution of Chemical Engineers
 ICJ
International Court of Justice
 ICM
Institute of Credit Management | Intergovernmental Committee for Migrations | International Confederation of Midwives
 ICN
infection control nurse | International Council of Nurses
 ICP
intracranial pressure
 ICQ
a computer program that makes contact with a user who is chatting online
 ICR
Institute for Cancer Research | intelligent character recognition
 ICRC
International Committee of the Red Cross
 ICRP
International Commission on Radiological Protection
 ICS
instalment credit selling | Institute of Chartered Shipbrokers | International Chamber of Shipping | investors’ compensation scheme
 ICSH
interstitial-cell-stimulating hormone
 ICSI
intracytoplasmic sperm injection
 ICSID
International Centre for Settlement of Investment Disputes
 ICT
information and communications technologies
 ICU
intensive care unit
 I’d
I had | I would or I should
 ID
Idaho | identification | infectious disease(s) | inner diameter | inside diameter | internal diameter | intradermal
 id.
idem
 IDA
Infocomm Development Authority | International Development Association
 IDB
Industrial Development Bank
 IDC
industrial development certificate
 IDD
insulin-dependent diabetes | international direct dialling
 IDE
integrated drive electronics
 IDK
I don’t know | internal derangement of the knee
 IDP
integrated data processing | iodine diphosphate
 IDR
International Depository Receipt
 IDTS
I don’t think so
 IDTT
I’ll drink to that
 ie
Ireland
 i.e.
that is
 IEE
Institution of Electrical Engineers
 IEEE
Institute of Electrical and Electronic Engineers
 IEN
Internet experiment note
 IESG
Internet Engineering Steering Group
 IETF
Internet Engineering Task Force
 IF
intermediate frequency
 IFA
independent financial adviser | Institute of Financial Accountants
 IFC
International Finance Corporation
 IFOR
Implementation Force
 IFR
instrument flying regulations
 Ig
immunoglobulin
 IgA
immunoglobulin A
 IgD
immunoglobulin D
 IgE
immunoglobulin E
 IgG
immunoglobulin G
 IgM
immunoglobulin M
 IGM
International Grandmaster
 ign.
ignites | ignition | unknown
 IGP
interior gateway protocol
 IGT
Indicazione Geografica Tipica
 IH
interrupt handler
 IHD
ischaemic heart disease
 ihp
indicated horsepower
 IHS
Jesus
 IHT
inheritance tax
 iid
independent identically distributed
 IIL
integrated injection logic
 IINM
I’m not mistaken
 IIRC
I remember (or recall) correctly
 IJWTK
I just want to know
 IJWTS
I just want to say
 IKBS
intelligent knowledge-based system
 IKWUM
I know what you mean
 il
Israel
 IL
Illinois
 IL-1
interleukin-1
 IL-2
interleukin-2
 ILG
index-linked gilt
 I’ll
I will or I shall
 ill.
illustrated | illustration | illustrator
 illus.
illustrated | illustration | illustrator
 ILM
internal labour market
 ILO
International Labour Organization
 ILS
instrument landing system | ionization-loss spectroscopy
 im
Isle of Man
 I’m
I am
 IM
International Master | instant messaging | intramuscular
 IMA
I might add | Interactive Multimedia Association | International MIDI Association | Investment Management Agreement | Investment Management Association
 IMarE
Institute of Marine Engineers
 IMCO
Intergovernmental Maritime Consultative Organization
 IME
in my experience
 IMechE
Institution of Mechanical Engineers
 IMF
International Monetary Fund
 IMHO
in my humble opinion
 IMinE
Institution of Mining Engineers
 imit.
imitation | imitative
 IMM
International Mercantile Marine | International Monetary Market
 IMMA
insured money market account
 immun.
immunity | immunization | immunology
 IMO
in my opinion | International Meteorological Organization | International Miners’ Organization
 IMP
imperial | interface message processor | International Match Point
 imp.
imperative | imperfect | imperial | impersonal | import | important | imported | importer | imprimatur
 Imp.
Emperor | Empress
 imperf.
imperfect | imperforate
 IMRO
Investment Management Regulatory Organization
 IMRT
intensity modulated radiation therapy
 IMS
Indian Medical Service | information management systems | Institute of Management Services
 in
India
 In
indium
 IN
Indiana
 in.
inch
 INAO
Institut Nationale des Appellations d’Origine
 inc.
included | including | inclusive | income | incomplete | incorporated | increase
 Inc.
Incorporated
 incl.
including | inclusive
 incr.
increase | increased | increasing | increment
 IND
in God’s name
 ind.
independence | independent | index | indicative | indirect | industrial | industry
 Ind.
Independent | India | Indian | Indies
 indef.
indefinite
 indic.
indicating | indicative | indicator
 INDO
Instituto Nacional de Denominaciones de Origen
 indus.
industrial | industry
 INF
intermediate-range nuclear forces
 infl.
inflammable | inflorescence | influence | influenced
 info
information
 INH
isoniazid
 inj.
injection | injury
 INLA
Irish National Liberation Army
 INN
international nonproprietary name
 innit
isn’t it
 INPO
in no particular order
 INRI
Jesus of Nazareth, king of the Jews
 ins.
inscription | inspector | insulation | insurance
 INSEAD
Institut Européen d’Administration des Affaires
 INSET
in-service education and training
 insp.
inspected | inspector
 inst.
instant | instantaneous | institute | institution | institutional
 Inst.
Institute | Institution
 instr.
instruction | instructor | instrument | instrumental
 int
international organization
 int.
intelligence | intercept | interest | interim | interior | interjection | intermediate | internal | international | interpreter | intersection | interval | interview | intransitive
 Int.
International
 Intelsat
International Telecommunication Satellite Organization
 intens.
intensifier | intensify | intensive
 interj.
interjection
 Interpol
International Criminal Police Organization
 interrog.
interrogate | interrogation | interrogative
 intl
international
 intro.
introduction | introductory
 introd.
introduction | introductory
 INTUC
Indian National Trade Union Congress
 inv.
invariable | invented | invention | inventor | invoice
 io
British Indian Ocean Territory
 I/O
input/output
 IOC
International Olympic Committee
 IOD
Institute of Directors
 IOL
intraocular lens
 IOM
Isle of Man
 IOP
input/output processor
 IORQ
input/output request
 IOSCO
International Organization of Securities Commissions
 IOU
a written acknowledgment of a debt between the writer and somebody else
 IOUS
intraoperative ultrasound
 IOW
in other words
 IP
image processing | information provider | Internet protocol
 I/P
input
 IPA
Institute of Practitioners in Advertising | International Phonetic Alphabet
 IPCC
Intergovernmental Panel on Climate Change
 IPE
International Petroleum Exchange
 IPL
initial program load | initial program loader
 IPM
integrated pest management | Institute of Personnel Management
 IPO
initial public offering
 IPPV
intermittent positive pressure ventilation
 IPR
Indicação de Proveniencia Regulamentada | intellectual property rights
 ips
inches per second
 IPSE
integrated project support environment
 iq
Iraq
 IQ
intelligence quotient
 ir
Iran
 Ir
iridium
 IR
index register | information retrieval | infrared (radiation) | infrared (radiation) | Inland Revenue | instruction register
 Ir.
Ireland | Irish
 IRA
Individual Retirement Account | Irish Republican Army
 IRBM
intermediate-range ballistic missile
 IRC
Internet relay chat
 IRCA
Industrial Relations Court of Australia
 IRD
Inland Revenue Department
 IRDS
infant respiratory distress syndrome
 IRL
in real life
 IRO
Inland Revenue Office | International Refugee Organization | International Relief Organization
 IRQ
interrupt request
 IRR
internal rate of return
 IRS
Internal Revenue Service
 IRSG
Internet research steering group
 IRTF
Internet research task force
 is
Iceland
 IS
income support | information services
 is.
island | isle
 Is.
Isaiah | Island | Isle
 ISA
individual savings account | Industry Standard Architecture | International Standard Atmosphere
 Isa.
Isaiah
 ISAM
indexed sequential access method
 ISBN
International Standard Book Number
 ISC
intermittent self-catheterization | Insurance and Superannuation Commission
 ISD
international subscriber dialling
 ISDA
International Swaps and Derivatives Association
 ISDN
Integrated Services Digital Network
 ISE
International Stock Exchange
 ISIC
International Standard Industrial Classification
 IS-IS
intermediate system to intermediate system
 isl.
island | isle
 ISMA
International Securities Market Association
 isn’t
is not
 ISO
Imperial Service Order | International Organization for Standardization
 ISP
Internet service provider
 ISR
information storage and retrieval
 ISS
I said so | injury scoring system | International Space Station
 ISSN
International Standard Serial Number
 Isth.
isthmus
 ISWIM
if (you) see what I mean
 it
Italy
 IT
income tax | information technology
 ITA
Independent Television Authority | Initial Teaching Alphabet
 ital.
italic | italics
 Ital.
Italian | Italy
 ITC
Independent Television Commission
 ITCZ
intertropical convergence zone
 it’d
it had | it would
 it’ll
it will
 ITM
in the money
 ITRW
in the real world
 it’s
it has | it is
 ITS
invitation to send
 ITU
intensive therapy unit | International Telecommunication Union
 ITV
Independent Television
 IU
international unit
 IUCD
intrauterine contraceptive device
 IUCN
International Union for the Conservation of Nature
 IUD
intrauterine device
 IUS
intrauterine system
 IV
intravenous | intravenously
 I’ve
I have
 IVF
in vitro fertilization
 IVP
intravenous pyelogram
 IVR
interactive voice response
 IVU
intravenous urography.
 IWC
International Whaling Commission
 IWIK
I wish I knew
 IWUTK
I want you to know
 IWW
Industrial Workers of the World
 IYKWIM
if you know what I mean
 IYSS
if you say so


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Abbreviations