| Subject | English | Spanish |
| meteorol. | back door cold front | frente frío retrógrado |
| forestr. | back-to front | de atrás hacia adelante |
| comp., MS | front-end/back-end application | aplicación front-end/back-end (" An application consisting of a "back-end" database file that contains tables, and copies of a "front-end" database file that contain all other database objects with links to the back-end tables.") |
| commun. | front-to-back ratio | relación de radiación anterior/posterior |
| IT | front-to-back ratio | relación anterior-posterior |
| IT | front-to-back ratio | relación frente-espalda |
| tech. | front-to-back ratio | eficacia direccional |
| commun., transp. | front-to-back scattering ratio | eficacia de dispersión direccional |