| Subject | English | Catalan |
| environ. | linear source of sound Point noise sources placed one after the other one as, for instance, in a row of cars moving on a road | font lineal de so |
| comp., MS | source of authority | origen d'autoritat (The location where Active Directory directory service objects, such as users and groups, are mastered (an original source that defines copies of an object) in a cross-premises deployment) |
| environ. | source of pollution The place, places or areas from where a pollutant is released into the atmosphere or water, or where noise is generated. A source can be classified as point source, i.e. a large individual generator of pollution, an area source, or a line source, e.g. vehicle emissions and noise | fonts de contaminació |
| environ. | use of waste as energy source | ús a efectes energètics |