| Acronym | Meaning |
 | ICITA | International Cooperative Investigation Of The Tropical Atlantic |
| ICITA | International Cooperative Investigation Of The Tropical Atlantic |
| ICJOB | IBM-to-Cray Interactive Interface |
| ICMAP | CSMP |
| ICMSSR | Interagency Committee For Meteorological Services And Supporting Research |
| ICMUA | IAMAS Commission On The Meteorology Of The Upper Atmosphere |
| ICN | International Communications Network |
| ICO | Interagency Committee On Oceanography |
| ICO | Initial Operating Capability |
| ICPM | International Commission On Polar Meteorology |
| ICS | Intercom System |
| ICS | Interdisciplinary Climate Systems |
| ICSI | International Commission On Snow And Ice |
| ICSU | International Council Of Science |
| ICWF | Interactive Computer Worded Forecast |
| ICWG | International Coordinating Working Group |
| ICWWP | Interagency Committee For World Weather Programs |
| ID | Inside Diameter |
| IDA | Institute For Defense Analysis |
| IDASS | Integrated Data Assimilation/Sounding System |
| IDB | Immediate Direct Broadcast |
| IDCS | Image-dissector Camera System |
| IDD | Internet Data Distribution |
| IDD | Interface Definition Document |
| IDEA LAB | Interactive's Digital Environmental Analysis Lab |
| IDEAS | Instrumentation Development And Education In Airborne Science |
| IDI | Instrumentation Development And Intercomparisons |
| IDL | Interactive Display Language |
| IDL | Interactive Data Language |
| IDL | Interface Definition Language |
| IDNDR | International Decade For Natural Disaster Reduction |
| IDNHR | International Decade Of Natural Hazard Reduction |
| IDOE | International Decade Of Ocean Exploration |
| IDR | Incremental Design Review |
| IDS | Interdisciplinary Study |
| IDS | International Data Service |
| IEA | International Energy Agency |
| IEE | Institute Of Electrical Engineers |
| IEEE | Institute Of Electrical And Electronic Engineers |
| IEF | Inventory Exchange Format |
| IEIS | Integrated Earth Information Server |
| IERS | International Earth Rotation Service |
| IF | Intermediate Frequency |
| IF | In-flight |
| IFA | Intensive Flux Array |
| IFAW | International Fund For Animal Welfare |
| IFC | Intensive Field Campaign |
| IFC | InFlight Black Body Calibrator |
| IFD | Indirect Flare Detector |
| IFD | In-flight Deployment |
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