| Subject | English | Spanish |
| earth.sc. | absorber portion | parte absorbente |
| mech.eng. | active portion of the path of contact | segmento de engrane |
| commun. | address portion | solapa de dirección |
| chem. | analytical portion | porción analítica |
| nat.sc. | analytical portion for test | parte alícuota para la prueba |
| health. | antigenic portion | porción antigénica |
| transp., mech.eng. | application valve portion | módulo de frenado |
| med. | cardiac portion of stomach | porción cardial del estómago |
| patents. | characteristic portion | parte característica |
| med. | chicken leg with a portion of the back | cuarto trasero de pollo |
| agric. | chicken leg with a portion of the back attached to it | cuarto trasero de pollo |
| IT, dat.proc. | content portion | porción de contenido |
| IT, dat.proc. | content portion description | descripción de porción de contenido |
| nucl.pow. | conventional portion of the nuclear power plant | parte convencional de la planta de energía nuclear |
| mech.eng. | core cooling portion of safety injection system | parte de refrigeración del núcleo del sistema de inyección de seguridad |
| el.mot. | core portion | porción de núcleo |
| el.mot. | core portion | porción de ranura |
| el.mot. | core portion | lado de bobina en el hierro |
| mech.eng. | cranked portion of a shaft | acodamiento del cigüeñal |
| commun. | cut-out portion | parte recortable |
| hobby, cultur. | cylindrical shell portion | envolvente cilíndrico |
| med. | deep portion of flexor pollicis brevis muscle | porción profunda del flexor corto del pulgar (caput profondum musculi flexoris pollicis brevis) |
| fin. | domestic portion of intra-Community journey | tramo nacional del transporte intracomunitario |
| food.serv. | edible portion | porción comestible |
| comp., MS | e-mail alias (The portion of the e-mail address that appears to the left of the | alias de correo electrónico |
| gen. | emergency core cooling portion | parte de refrigeración de emergencia del núcleo |
| IMF. | ESAF Trust portion of ESAF or SAF loan | con cargo a la Cuenta Fiduciaria del SRAE |
| IMF. | ESAF Trust portion of ESAF or SAF loan | parte de los préstamos en el marco del SRAE o el SAE financiada |
| earth.sc., mech.eng. | face portion plane sealing | estanqueidad de cara lateral por contacto |
| gen. | fine grained portion | finos |
| gen. | fine grained portion | parte de grano fino |
| fish.farm. | fish portion | porción de pescado |
| mater.sc., mech.eng. | fractional portion | envase unitario |
| mater.sc., mech.eng. | fractional portion | ración envasada |
| mater.sc., mech.eng. | fractional portion | envase individual |
| agric. | front portion of mouldboard | borde cortante de la vertedera |
| IT, dat.proc. | generic content portion | porción de contenido genérico |
| IT, dat.proc. | generic content portion description | descripción de porción de contenido genérico |
| mech.eng. | headless set screw with unthreaded portion | prisionero con vástago parcialmente roscado |
| ecol. | hide in an inaccessible portion of burrow | encodillarse |
| med. | hyoid part of the petrous portion of the temporal bone | parte hioidea del hueso temporal |
| mun.plan. | ice cream portion server | molde para formar las bolas de helado |
| IT, dat.proc. | to ignore a loop portion | ignorar una parte de un bucle |
| agric. | in portions | en trozos |
| agric. | in portions | troceado |
| agric. | in portions | en porciones |
| fin. | income portion | escala de ingresos |
| agric. | individual portion | porción individual |
| law, tax. | legal portion | porción hereditaria correspondiente legalmente |
| law, tax. | legal portion | parte abintestata |
| law, tax. | legal portion | legítima |
| med. | lumbar portion of the spine | porción lumbar de la columna vertebral |
| med. | main secreting portion of gland | parte del segmento final de una glándula secretora |
| med. | main secreting portion of gland | parte principal del nefrón |
| radio | major portion of the Earth's atmosphere | parte principal de la atmósfera terrestre |
| IT | operand portion | parte de operando |
| IT | operand portion | sección de operando |
| fin. | outstanding portion of the original issue | parte de la emisión original que permanezca en circulación |
| transp., mater.sc. | parabola portion | porción de parábola |
| mech.eng. | portion of a piece | parte de una pieza |
| market. | portion of investment grants relating to the period transferred to income | subvenciones de capital traspasadas al resultado del ejercicio |
| fin. | portion of loans | tramo del préstamo |
| proced.law. | portion of the estate to devolve compulsorily upon the heirs | reserva |
| proced.law. | portion of the estate to devolve compulsorily upon the heirs | legítima |
| pack. | portion pack | ración envasada (cantidad envasada de un producto, para una sola consumición) |
| mater.sc., mech.eng. | portion pack | ración envasada |
| mater.sc., mech.eng. | portion pack | envase unitario |
| mater.sc., mech.eng. | portion pack | envase individual |
| pack. | portion pack | individual |
| agric. | portion turkey | pavo de porción |
| industr., construct. | puffed portion | rib |
| med. | pyloric portion of the stomach | porción pilórica del estómago |
| industr., construct. | raised portion | rib |
| avia. | rear portion | parte trasera |
| agric. | rear portion of mouldboard | parte posterior de la vertedera |
| agric. | rear portion of mouldboard | ala de la vertedera |
| pack. | removal of portions | utilización de las dosis de consumo |
| tech., mater.sc. | removal of portions | toma |
| tech., mater.sc. | removal of portions | utilización de las unidades |
| tech., mater.sc. | removal of portions | dosis de consumo |
| pack. | removal of portions | utilización de las unidades de consumo |
| proced.law. | reserved portion | legítima |
| proced.law. | reserved portion of the estate | reserva |
| proced.law. | reserved portion of the estate | legítima |
| med. | residual placenta portions | residuos placentarios |
| fin. | to return to the reserve the unused portion of the share | devolver a la reserva la parte no utilizada de la cuota |
| forestr. | rotted portion | porción podrida |
| health. | sachet portion | sobre de dosis |
| chem. | sample portion | porción de muestra |
| chem. | sampled portion | porción de muestra |
| nat.sc., agric. | semen portioning | distribución del semen |
| med. | to sequence portions of the genome | secuenciar las porciones del genoma |
| mater.sc., mech.eng. | single portion pack | ración envasada |
| mater.sc., mech.eng. | single portion pack | envase individual |
| mater.sc., mech.eng. | single portion pack | envase unitario |
| pack. | single portion pack | ración envasada (cantidad envasada de un producto, para una sola consumición) |
| pack. | single portion pack | individual |
| mater.sc., mech.eng. | single portion packing machine | máquina para envasar unidades o dosis previstas de una mercancía |
| pack. | single portion packing machine | máquina para envasar dosis previstas de una mercancía |
| pack. | single portion packing machine | máquina para envasar unidades previstas de una mercancía |
| IT, dat.proc. | to skip a loop portion | ignorar una parte de un bucle |
| el.mot. | slot portion | porción de núcleo |
| el.mot. | slot portion | porción de ranura |
| el.mot. | slot portion | lado de bobina en el hierro |
| proced.law. | some countries grant a certain reserved portion to the surviving spouse | reservatario |
| transp. | starting point of curved portion | origen de la curva |
| transp. | steeply overhanging portion of the hull | parte más lanzada del casco |
| tech., mater.sc. | taking out of portions | toma |
| tech., mater.sc. | taking out of portions | utilización de las unidades |
| tech., mater.sc. | taking out of portions | dosis de consumo |
| pack. | taking out of portions | utilización de las dosis de consumo |
| pack. | taking out of portions | utilización de las unidades de consumo |
| fin. | taxable portion | base imponible |
| chem. | test portion | porción analítica |
| transp., construct. | the kerb channel/gutter is formed by a raised kerb and a portion of the road surface | contrabordillo |
| met. | transition radius between the parallel portion of the test piece and the grip heads | acuerdo entre la porcion paralela de la probeta y las cabezas de sujecion |
| econ. | undrawn portion of a loan | saldo no utilizado de un préstamo |
| mech.eng. | unthreaded portion | parte lisa |
| mech.eng. | unthreaded portion | parte no roscada |
| comp., MS | username (The name by which a user is identified to a computer system or network. During the logon process, the user must enter the username and the correct password. If the system or network is connected to the Internet, the username generally corresponds to the leftmost part of the user's e-mail address (the portion preceding the | nombre de usuario |
| el. | visible portion of the spectrum | porción visible del espectro |
| chem. | weighed portion | porción pesada |
| met. | weight of portion of core wire melted | peso del metal fundido |
| met. | weight of portion of electrode melted | peso del electrodo fundido |
| meteorol. | wrap-around portion of a cyclone | región de arrollamiento del ciclón |