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Word(s) in meaning: chat "global warming" Postal codes: USA: 81657, Canada: T5A 0A7 
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Your abbreviation search returned 148 meanings
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showing only Science & Medicine definitions (Show all) |
| Category Filters > | All definitions (148) |
Information Technology (23) |
Military & Government (29) |
Science & Medicine (50) |
Organizations, Schools, etc. (20) |
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| sort results: alphabetical | rank ? | |||
| Rank | Abbr. | Meaning | |
|---|---|---|---|
| ****** | Si | Silicon | |
| ****** | SI | Self-Injury | |
| ****** | SI | Square Inch(es) | |
| ****** | SI | Smithsonian Institution | |
| ****** | SI | Signal Integrity | |
| ****** | SI | Spark Ignition | |
| ****** | SI | Slightly Included (second lowest quality of diamond) | |
| ****** | SI | Serious Injury | |
| ****** | SI | Standardization (Flight) Instructor | |
| ****** | SI | Sensory Integration | |
| ****** | SI | Sexual Intercourse | |
| ****** | SI | Small Intestine | |
| ***** | SI | Seriously Ill | |
| ***** | SI | Scientific Investigation | |
| ***** | SI | Sacroiliac | |
| ***** | SI | Sacroiliac Joint | |
| ***** | SI | Système International d'Unités (international system of units based on the Meter, Kilogram, Second, Ampere, Kelvin, Candela, and Mole) | |
| ***** | SI | Suicidal Ideation | |
| ***** | SI | Scientific Instrument | |
| ***** | SI | Step-Index | |
| ***** | SI | SPARC International, Inc. | |
| **** | SI | Specific Impulse (measure of efficiency of rocket engines) | |
| **** | SI | Saturation Index | |
| **** | SI | Science Instrument (Hubble Telescope) | |
| **** | SI | Soil Investigation | |
| **** | SI | Speech Impairment | |
| **** | SI | Shift-Invariant | |
| **** | SI | Systematic Innovation | |
| **** | SI | Secondary Injection | |
| **** | SI | Solar Influences | |
| **** | SI | Sucrase-Isomaltase Deficiency | |
| *** | SI | Safe Intake | |
| *** | SI | Surveillance Index | |
| *** | SI | Spray Injection | |
| *** | SI | Smoothness Index | |
| *** | SI | Scintillation Index | |
| *** | SI | Solar Inertial | |
| *** | SI | Supplementary Insulation | |
| *** | SI | Sport Injected (Honda) | |
| *** | SI | Simple Interference | |
| ** | SI | Sector Iridectomy (partial removal of the iris of the eye) | |
| ** | SI | Semiconductor Ignition | |
| ** | SI | Safety/Site Inspection | |
| ** | SI | Shadow Instruction (computer instruction set) | |
| ** | SI | Somatosensory Receiving Area (in parietal lobe of cortex) | |
| * | Si | Normalized Subthreshold Swing | |
| * | SI | Self-Incompatibility (botany) | |
| * | SI | Systems Intelligence (psychological theory) | |
| * | SI | Swine Influenza | |
| * | SI | Superimpose | |
| showing only Science & Medicine definitions (show all 148 definitions) | |||
| Note: We have 111 other definitions for SI in our Acronym Attic | |||
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