| SLI | purplish-black wild grape of the eastern United States with tough skins that slip easily from the flesh |
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| SLI | a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc. |
| SLI | a removable fitted cloth covering for upholstered furniture |
| SLI | a knot at the end of a cord or rope that can slip along the cord or rope around which it is made |
| SLI | a sweater that is put on by pulling it over the head |
| SLI | failing to hold or slipping out of place |
| SLI | a decrease of transmitted power in a mechanical system caused by slipping |
| SLI | decline from a standard level of performance or achievement |
| SLI | a painful rupture of the fibrocartilage of the disc between spinal vertebrae |
| SLI | low footwear that can be slipped on and off easily |
| SLI | a person who slips or slides because of loss of traction |
| SLI | any of several chiefly American wildflowers having an inflated pouchlike lip |