| Subject | English | Spanish |
| transp., avia. | a fifth-freedom traffic right | derecho de tráfico de quinta libertad |
| environ. | Conference for a Fifth Geneva Convention | Conferencia para el Quinto Convenio de Ginebra |
| med. | Duncan's ventricle fifth ventricle | ventrículo de Duncan (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | ventrículo quinto (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | ventrículo de Vieussens (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | seudocele (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | cavidad del septum lucidum (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | ventrículo de Sylvio (cavum septi pellucidi, camera septi pellucidi) |
| med. | Duncan's ventricle fifth ventricle | ventrículo de Aranzio (cavum septi pellucidi, camera septi pellucidi) |
| math. | Euclid's Fifth Postulate | el Quinto Postulado de Euclides |
| math. | Euclid's Fifth Postulate | Quinto Postulado de Euclides |
| law | fifth amendment | quinta enmienda (constitucional) |
| tech. | fifth bend | codo de 72 grados |
| UN | Fifth Committee | Quinta Comisión |
| UN | Fifth Committee | Comisión de Asuntos Administrativos y de Presupuesto |
| med. | fifth cranial nerve | quinto par (par quintum) |
| med. | fifth cranial nerve | nervio trifacial (par quintum) |
| med. | fifth cranial nerve | quinto nervio craneal (par quintum) |
| med. | fifth cranial nerve | nervio trigémino (par quintum) |
| med. | fifth disease | quinta enfermedad (erythema infectiosum, erythema simplex marginatum, morbus quintus, megalerythema epidemicum) |
| med. | fifth disease | eritema de Hutinel (erythema infectiosum, erythema simplex marginatum, morbus quintus, megalerythema epidemicum) |
| med. | fifth disease | eritema infeccioso (erythema infectiosum, erythema simplex marginatum, morbus quintus, megalerythema epidemicum) |
| environ. | Fifth European Community programme of policy and action in relation to the environment and sustainable development | programa comunitario de política y actuación en materia de medio ambiente y desarrollo sostenible |
| environ. | Fifth European Community programme of policy and action in relation to the environment and sustainable development | Programa comunitario de política y actuación en materia de medio ambiente y desarrollo sostenible "Hacia un desarrollo sostenible" |
| nucl.phys. | Fifth framework programme of the European Atomic Energy Community Euratom for research and training activities | Quinto programa marco de la Comunidad Europea de la Energía Atómica Euratom para acciones de investigación y de enseñanza |
| R&D. | Fifth framework programme of the European Community for research, technological development and demonstration activities | Quinto programa marco de la Comunidad Europea para acciones de investigación, desarrollo tecnológico y demostración |
| R&D. | Fifth Framework Programme of the European Community for research, technological development and demonstration activities | quinto programa marco de la Comunidad Europea para acciones de investigación, demostración y desarrollo tecnológicos 1998-2002 |
| transp., avia. | fifth freedom | quinta libertad |
| gen. | "fifth freedom" | quinta libertad |
| gen. | "fifth freedom" | libre circulación del conocimiento |
| transp. | fifth-freedom air carrier | derecho de tráfico de quinta libertad |
| transp., avia. | fifth-freedom air carrier | compañía aérea de quinta libertad |
| transp., avia. | fifth freedom of the air | quinta libertad |
| transp., avia. | fifth freedom right | quinta libertad |
| gen. | fifth freedom rights | derecho de quinta libertad |
| transp., avia. | fifth freedom traffic right | quinta libertad |
| fin., transp. | fifth-freedom traffic right | derecho de tráfico de quinta libertad |
| IT | fifth generation | quinta generación |
| IT | fifth generation computer | ordenador de quinta generación |
| IT | Fifth Generation Computer System | sistema de ordenadores de la Quinta Generación |
| ed., IT | fifth generation product | producto de la quinta generación |
| entomol. | fifth instar hopper | ninfa en quinto estadio larvario |
| entomol. | fifth instar hopper | quinto instar |
| tech. | fifth mount | quinto montaje |
| fin. | fifth own resource | quinto recurso propio |
| med. | fifth pair | quinto nervio craneal (par quintum) |
| med. | fifth pair | quinto par (par quintum) |
| med. | fifth pair | nervio trifacial (par quintum) |
| med. | fifth pair | nervio trigémino (par quintum) |
| gen. | Fifth programme for the exchange of officials competent for veterinary matters | Quinto programa de intercambio de funcionarios competentes en el ámbito veterinario |
| gen. | Fifth Protocol to the General Agreement on Privileges and Immunities of the Council of Europe | Quinto Protocolo Adicional al Acuerdo General sobre Privilegios e Inmunidades del Consejo de Europa |
| anim.husb. | fifth quarter | piel y grasa de los animales sacrificados |
| agric. | fifth quarter | quinto cuarto |
| gen. | Fifth Republic Movement | Movimiento V República |
| gen. | Fifth Republic Movement | Movimiento Quinta República |
| fin. | fifth resource | quinto recurso |
| med. | fifth toe | quinto dedo del pie |
| med. | fifth toe | dedo pequeño del pie |
| med. | fifth venereal disease | linfogranuloma venéreo (lymphogranuloma venereum, lymphogranuloma venereum inguinale Frei's disease, poradenitis venerea, adenitis tropicalis) |
| med. | fifth venereal disease | bubón climático (lymphogranuloma venereum, lymphogranuloma venereum inguinale Frei's disease, poradenitis venerea, adenitis tropicalis) |
| med. | fifth venereal disease | enfermedad de Nicolás-Fabre (lymphogranuloma venereum, lymphogranuloma venereum inguinale Frei's disease, poradenitis venerea, adenitis tropicalis) |
| med. | fifth venereal disease | linfogranulomatosis inguinal (lymphogranuloma venereum, lymphogranuloma venereum inguinale Frei's disease, poradenitis venerea, adenitis tropicalis) |
| auto. | fifth wheel | punto de remolque |
| agric., tech. | fifth wheel of a tractor | placa de enganche |
| transp. | fifth wheel | corona de giro |
| agric., tech. | fifth wheel of a tractor | quinta rueda |
| transp. | fifth wheel coupler | acoplamiento de quinta rueda |
| transp., mech.eng. | fifth wheel coupling | acoplamiento |
| transp. | fifth wheel coupling | asiento de anclaje |
| transp. | fifth-wheel coupling | asiento de anclaje |
| transp. | fifth wheel coupling | acoplamiento de quinta rueda |
| transp., mech.eng. | fifth wheel coupling pin | pivote de acoplamiento |
| mech.eng. | fifth wheel coupling with positive steering | acoplamiento de quinta rueda dirigido |
| transp. | fifth-wheel kingpin | pivote de acoplamiento de la quinta rueda |
| transp., tech. | fifth wheel lead | avance de la quinta rueda |
| mech.eng. | fifth wheel steering | dirección de quinta rueda |
| IMF. | Financial Derivatives: A Supplement to the Fifth Edition 1993 of the Balance of Payments Manual | Instrumentos financieros derivados: Suplemento a la quinta edición 1993 del Manual de Balanza de Pagos |
| mech.eng. | load on the fifth wheel coupling pin | carga sobre el pivote de acoplamiento |
| mech.eng. | maximum permitted fifth wheel load | carga máxima autorizada en la quinta rueda |
| IMF. | Revision of the Balance of Payments Manual, Fifth Edition Annotated Outline | Reseña Comentada |
| IMF. | Revision of the Balance of Payments Manual, Fifth Edition Annotated Outline | Revisión del Manual de Balanza de Pagos, Quinta Edición (Reseña Comentada) |
| corp.gov. | seventy-fifth percentile | percentil 75º |
| el. | 3-signal fifth-order mix | mezcla de quinto orden de tres señales |
| mech.eng. | sliding fifth wheel | quinta rueda deslizante |
| auto. | sliding fifth wheel | punta de remolque deslizante |
| el. | three-signal fifth-order mix | mezcla de quinto orden de tres señales |