| Acronym | Meaning |
 | NEBD | Nonequilibrium Brownian Dynamics |
| NEBLA | Non-equilibrium Boundary Layer Analysis |
| NEBOSH | National Examination Board In Occupational Safety And Health |
| NEC | National Electrical Code |
| NECAC | National Environmental Compliance Assistance Center |
| NECEEM | Nonequilibrium Capillary Electrophoresis Of Equilibrium Mix |
| NECTAR | National Electronic Clinical Trials And Research |
| NEDB | National Exposure Database (HSE) |
| NEDO | The New Energy Development Organization (Japan) |
| NEDOR | Nuclear Electron Double Resonance |
| NEDS | National Emission Data System (USEPA) |
| NEDT | Noise Equivalent Delta T |
| NEE | Net Ecosystem Exchange |
| NEE | Nanoelectrode Ensemble |
| NEEIA | Nonseparation Electrochemical Enzyme Binding/immunoassay |
| NEET | National Environmental Education And Training Program |
| NEET | Nuclear Excitation In Electronic Transition |
| NEGF | Nonequilibrium Green Function |
| NEHA | National Environmental Health Association |
| NEIC | National Enforcement Investigations Center |
| NEIS | National Environmental Information Service |
| NEJAC | National Environmental Justice Advisory Council |
| NEKIA | National Education Knowledge Industry Association |
| NEL | No Effect Level |
| NELAC | National Environmental Laboratory Accreditation Conference |
| NELAP | National Environmental Laboratory Accreditation Program |
| NELC | Non-exclusion Liquid Chromatography |
| NEM | NAAQS Exposure Model |
| NEMA | National Electrical Manufactures Association |
| NEMCA | Non-faradaic Electrochemical Modification Of Catalytic Activity |
| NEMD | Non-equilibrium Molecular Dynamics |
| NEMI | National Environmental Methods Index |
| NEMO | Nonempirical Molecular Orbital |
| NEMS | Nanoelectromechanical Systems |
| NEO | Near-Earth Objects |
| NEOPS | North East Oxidant And Particle Study |
| NEPA | National Environmental Policy Act |
| NEPHGE | Non-equilibrium PH Gradient Electrophoresis |
| NEPP | National Energy Policy Plan |
| NER | Nucleotide Excision Repair |
| NERAC | New England Research Applications Center |
| NERC | Natural Environment Research Council (UK) |
| NERC | North American Electric Reliability Council |
| NERD | Neutron Elastic Recoil Detection |
| NEROS | Northeast Regional Oxidant Study |
| NERVA | Nuclear Engine For Rocket Vehicle Application |
| NES | National Energy Strategy |
| NES | Neurobehavioral Evaluation System |
| NES | US National Eutrophication Study |
| NES | Nuclear Export Signal |
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