| Acronym | Meaning |
| MIC | Microwave Integrated Circuit |
| MIC | Minimal Inhibitory Concentration |
| MICE | Methods Information Communications Exchange |
| MICROSS | Micro-computer Based River Oil Spill Simulation |
| MICROTAS | Micro-Total Analysis Systems |
| MICS | Magnetospheric Ion Compn. Spectrometer |
| MICSPOMS | Metal Island Coated Swelling Polymer Over Mirror System |
| MIDA | Mass Isotopomer Distribution Analysis |
| MIDAS | Manchester Information Datasets And Associated Services |
| MIDAS | Metal Ion-dependent Adhesion Site |
| MIDAS | Microimaging Dust Analysis System |
| MIDAS | Model Of Ion Dynamics And Acidification Of Soil |
| MIDDAS | Microdiameter Depth Adsorption Systems |
| MIDI | Split Valence Plus Polarization Function (basis Set) |
| MIDI-N | Split-type Contracted GTO Basis Set (n = 1 |
| MIDP | Microwave Induced Delayed Phosphorescence |
| MIE | Metal-induced Embrittlement |
| MIEHM | Modified Iterative Extended Hueckel Method |
| MIEMS | Membrane Inlet Electrochemical Mass Spectrometry |
| MIES | Maximum Ionicity Excited State (model In Energy Calcn. Of Mols.) |
| MIES | Metastable Impact Electron Spectroscopy |
| MIESR | Matrix Isolation Electron Spin Resonance |
| MIF | Migration Inhibitory Factor |
| MIG | Metal Inert Gas (welding) |
| MIGD | Million Imperial Gallon Per Day |
| MIGS | Metal-induced Gap State |
| MIH | Method Of Intermediate Hamiltonians |
| MIIT | Materials Interface Interactions Test |
| MIKE | Mass-analyzed Ion Kinetic Energy (spectrometry) |
| MIKES | Mass-analyzed Ion-kinetic Energy Spectrometry |
| MILC | Metal Induced Lateral Crystallization |
| MILES | Micro In Situ Laser Extraction System |
| MIM | Metal Injection Molding |
| MIM | Multipole-induced-multipole Model |
| MIMAS | MIcronization And MASter Blend |
| MIMIC | Micromolding In Capillaries |
| MIMIC | Microwave And Millimeter Wave Monolithic Integrated Circuit |
| MIMS | Magnetic Field Induced Mixing Of Sublevels |
| MIMS | Membrane Introduction Mass Spectrometry |
| MINDAP | Microwave-induced Nitrogen Discharge At Atmospheric Pressure |
| MINDO | Modified Intermediate Neglect Of Differential Overlap |
| MINDO/3L | Modified Intermediate Neglect Of Differential Overlap/3 For Limited Electrons |
| MINDO/SR | MINDO S=overlap Integral R=internuclear Distance |
| MINI-N | Minimal-type Contracted Gto Basis Set (n= 1 |
| MINLP | Mixed-integer Nonlinear Programming |
| MINOS | Main Injector Neutrino Oscillation Search |
| MINT | Metal In-line Treatment |
| MINTEQA2 | Metal Speciation Equilibrium For Surface And Ground Water |
| MIONP | Microwave Induced Optical Nuclear Polarization |
| MIOSA | Modified (rotational) Infinite Order Sudden Approxn. |