| Abbreviation | Description |
| Comsat | Communications Satellite Corporation |
| CP | Colombo Plan |
| CPLP | Comunidade dos Paises de Lingua Portuguesa |
| CSTO | Collective Security Treaty Organization |
| CTBTO | Preparation commission for the Nuclear-Ban-Treaty Operation |
| CY | calendar year |
| DC | developed country |
| DDT | dichloro-diphenyl-trichloro-ethane |
| Desertification | United Nations Convention to Combat Desertification in Those Countries Experiencing Serious Drought and/or Desertification, Particularly in Africa |
| DIA | United States Defense Intelligence Agency |
| DSN | Defense Switched Network |
| DST | daylight savings time |
| DWT | deadweight ton |
| EAC | East African Community |
| EADB | East African Development Bank |
| EAEC | Eurasian Economic Community |
| EAPC | Euro-Atlantic Partnership Council |
| EBRD | European Bank for Reconstruction and Development |
| EC | European Community |
| ECA | Economic Commission for Africa |
| ECE | Economic Commission for Europe |
| ECLAC | Economic Commission for Latin America and the Caribbean |
| ECO | Economic Cooperation Organization |
| ECOSOC | Economic and Social Council |
| ECOWAS | Economic Community of West African States |
| ECS | European Coal and Steel Community |
| ECSC | European Coal and Steel Community |
| EEC | European Economic Community |
| EEZ | exclusive economic zone |
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