| Acronym | Definition |
|---|
| FESI➣Free Ecma Script Interpreter |
| FESI➣Fonds d'Entraide et de Solidarité Internationale (French: Assistance Fund and International Solidarity) |
| FESI➣Federation of the European Sporting Goods Industry |
| FESI➣Fédération Européenne des Syndicats d'Entreprises d'Isolation (French: European Federation of Trade Unions Business Insulation) |
| FESI➣Federacion Espanola de Sociedades de Informatica (Spain) |
| FESI➣Field-Enhanced Sample Injection |
| FESI➣Forum for Engineering Structural Integrity (UK) |
| FESI➣Family Economic Security Initiative (Californians for Economic Security) |