| Subject | French | English |
| IT, tech. | segment principal | root segment |
| IT | segment principal | master segment |
| IT | segment principal | root |
| IT, tech. | segment principal | main segment |
| IT, tech. | segment principal | resident segment |
| comp., MS | segment principal de code compte | main account code segment (A segment of a general ledger account code that corresponds to the type of account (for example, cash, sales, or travel expense)) |
| med. | segment principal du phono-cardiogramme | first heart sound segment |