Governmental & Military Abbreviations and Acronyms
- 4-DFour-Dimensional
- 4DDAFour-Dimensional Data Assimilation
- A-SARAdvanced Synthetic Aperture Radar
- A-SCATAdvanced Scatterometer
- A.2DAtlantic Reporter 2nd Series
- A.L.R.American Law Reports
- A.L.R. Fed.American Law Reports, Federal
- A.L.R.2dAmerican Law Reports, 2nd Series
- A.L.R.3dAmerican Law Reports, 3rd Series
- A.L.R.4thAmerican Law Reports, 4th Series
- A.L.R.5thAmerican Law Reports, 5th Series
- A.L.R.6thAmerican Law Reports, 6th Series
- AARIArctic and Antarctic Research Institute (Russian Federation)
- AASSRECAssociation of Asian Social Science Research Councils
- AAWORDAssociation of African Women for Research and Development
- ACMADAfrican Centre of Meteorological Applications for Development
- ACRIMActive Cavity Radiometer Irradiance Monitor (EOS)
- ACSYSArctic Climate System Study (WCRP)
- ADJ. PHR.adjectival phrase
- Advancemadvancement
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