| Subject | English | Spanish |
| commun., el. | base control unit | unidad de control base |
| comp., MS | base currency unit | unidad de divisa base (The computed currency unit in an exchange rate calculation) |
| police | base tactical unit | unidad táctica elemental |
| earth.sc., chem. | base unit | unidad base |
| comp., MS | base unit | unidad de base (A Surface developer unit that has metal panels, with the I/O connections exposed on one end of the unit. In contrast, a finished unit has acrylic side and end panels) |
| comp., MS | base unit | unidad base (A fundamental unit of measure in a system of measurement from which other units are derived) |
| IT | base unit | procesador maestro |
| el. | base unit | unidad de conmutación central |
| police | base unit | unidad de dirección |
| polym. | configurational base unit | unidad configuracional básica |
| stat. | geographic tabulation unit base | tabulación según zona geográfica |
| tech. | magneto base ignition unit | unidad de encendido con montaje en zócalo de magneto |
| stat., earth.sc., chem. | SI base unit | unidad SI base |