| Subject | Spanish | Portuguese |
| comp., MS, Braz. | aplicación front-end/back-end | aplicativo front-end/back-end |
| earth.sc., mech.eng. | "back boiler" | back boiler |
| comp., MS, Braz. | back-end | back-end |
| IMF. | back office | back office |
| construct. | "cut-back" | cut-back |
| construct. | "cut-back" | betume fluidificado |
| med. | feed-back | retroação |
| social.sc. | flash-backs | flash-back |
| industr., construct. | foam backs | avesso esponjoso |
| fin. | operación del tipo "back-to-back" | transação sem identificação mútua das partes |
| commun., IT | rolled back | retorno |
| comp., MS, Braz. | servidor back-end de CRM | Servidor Back-End de CRM |
| comp., MS | servidor back-end de CRM | Servidor Back-end do CRM |
| comp., MS, Braz. | servidor de base de datos back-end | servidor de banco de dados back-end |
