| Subject | English | Maltese |
| econ., min.prod. | A resource-efficient Europe | Ewropa effiċjenti fir-riżorsi |
| gen. | clean and energy-efficient road transport vehicle | vettura nadifa u enerġetikament effiċjenti |
| gen. | clean and energy-efficient vehicle | vettura nadifa u enerġetikament effiċjenti |
| econ., environ. | eco-efficient economy | ekonomija ekoeffiċjenti |
| ecol., energ.ind. | efficient bulb | lampa effiċjenti fl-enerġija |
| ecol., energ.ind. | efficient bulb | bozza effiċjenti fl-enerġija |
| gen. | efficient bulb | lampa effiċjenti |
| energ.ind. | efficient energy use | effiċjenza fl-użu tal-enerġija |
| energ.ind. | efficient energy use | effiċjenza fl-enerġija |
| comp., MS | Efficient File Storage | Ħżin Effiċjenti tal-Fajls (A storage method in which a file is split into pieces that are stored and updated separately, and streamed together when a user requests the file) |
| ecol., energ.ind. | energy efficient light bulb | bozza effiċjenti fl-enerġija |
| ecol., energ.ind. | energy efficient light bulb | lampa effiċjenti fl-enerġija |
| gen. | energy efficient light bulb | lampa effiċjenti |
| environ., energ.ind. | energy efficient technology | teknoloġija effiċjenti fl-enerġija |
| econ. | equally efficient competitor test | test tal-kompetitur ugwalment effiċjenti |
| econ. | equally efficient firm test | test tal-kompetitur ugwalment effiċjenti |
| commun., econ. | reasonably efficient competitor test | test tal-kompetitur raġonevolment effiċjenti |
| commun., econ. | reasonably efficient operator test | test tal-kompetitur raġonevolment effiċjenti |
| econ., environ., energ.ind. | resource-efficient | effiċjenti fir-riżorsi |
| econ., min.prod. | resource efficient economy | ekonomija effiċjenti fl-użu tar-riżorsi |
| gen. | resource efficient economy | ekonomija effiċjenti fir-riżorsi |
| econ., min.prod. | Resource efficient Europe | Ewropa effiċjenti fir-riżorsi |
| econ., min.prod. | resource-efficient Europe flagship | Ewropa effiċjenti fir-riżorsi |
| econ., min.prod. | resource-efficient Europe flagship initiative | Ewropa effiċjenti fir-riżorsi |
| ecol. | Water-Efficient Europe | Ewropa effiċjenti fl-użu tal-ilma |
| gen. | Water-Efficient Europe | Ewropa effiċjenti fl-ilma |