| Acronym | Meaning |
 | MNDOD | Modified Neglect Of Diatomic Overlap With D At. Orbitals |
 | MNOS | Metal-nitride Oxide Semiconductor |
 | MNSR | Miniature Neutron Source Reactor |
 | MNT | Molecular Nanotechnology |
 | MO | Molecular Orbital |
 | MOA | Maximum Overlap Approximation |
 | MOAG | MINDO Optimized Adjusted Geometries |
 | MOBI | MO Bond Index |
 | MOBK | Modified Oppenheimer-Brinkman-Kramers (approxn. In Calcns. On Atomic And Molecular Collisions With Ions) |
 | MOCD | Molecular Orbital Correlation Diagram |
 | MOCE | Marine Optical Characterization Experiment |
 | MOCED | Molecular Orbital Constrained Electron Diffraction Method |
 | MOCETGAO | Molecule-optimized Contracted Even-tempered Gaussian Atomic Orbital |
 | MOCIC | MO Constraint Of Interaction Coordinates |
 | MOCVD | Metal Org. Chem. Vapor Deposition |
 | MOD | Metalorganic Decomposition |
 | MODESC | Magnetooptically Detected Spin Conversion Spectroscopy |
 | MODFET | Modulation-doped Field-effect Transistor |
 | MODIS | Moderate Resolution Imaging Spectroradiometer |
 | MODPOT | Model Potential |
 | MODR | Microwave Optical Double Resonance |
 | MODS | Magneto-Optical Difference Spectroscopy |
 | MODS | Multiple Organ Dysfunction Syndrome |
 | MODULUS | Methods Of Determining And Understanding Light Elements From Unequivocal Stable Isotope Compositions |
 | MODY | Maturity Onset Diabetes Of The Young |
 | MOE | Margin Of Exposure |
 | MOE | Modulus Of Elasticity |
 | MOEMS | Micro-opto-electromechanical System |
 | MOEXP | Morse Oscillator Exponential Repulsion Potential |
 | MOF | Metal-organic Framework Compoundpar |
 | MOFAT | Multi Phase Flow And Transport |
 | MOFT | Minimum Oil Film Thickness |
 | MOG | Mobil Olefins-to-gasoline [process] |
 | MOG | Myelin Oligodendrocyte Glycoprotein |
 | MOGA | Michigan Oil And Gas Association |
 | MOI | Multiplicity Of Infection |
 | MOKE | Magneto-optic Kerr Effect |
 | MOLE | Molecular Optics Laser Examiner |
 | MOLED | Molecular Organic Light Emitting Diode |
 | MOLIERE (V5) | Microwave Observation LIne Estn. And Retrieval |
 | MOLLI | Modular Luminescence Lifetime Imaging System |
 | MOM | Maximum Overlap Method |
 | MOM | Modified Operator Method (for Energy-level Calcns.) |
 | MOMBE | Metal Organic Molecular-beam Epitaxy |
 | MOMO | Maximum Overlap Molecular Orbital |
 | MOMP | Major Outer Membrane Protein |
 | MON | Motor (method) Octane No. |
 | MONES | Molecular Nonthermal Excitation Spectrometry |
 | MONOS | Metal Oxide Nitride Oxide Semiconductor |
 | MOPA | Master Oscillator Power Amplifier |