| Subject | English | Spanish |
| met. | addition agent | elemento de aleación |
| chem. | addition agent | aditivo |
| chem. | addition agent | agente de adición |
| math. | addition and subtraction facts | operaciones de suma y resta (Use operación when the emphasis is on the process) |
| math. | addition and subtraction facts | sumas y restas |
| chem. | addition drop by drop | adición gota a gota |
| met. | addition element | elemento de aleación |
| math. | addition fact | operación de suma (Use operación when the emphasis is on the process) |
| chem. | addition homopolymerization product | producto homopolimerizado de adición |
| met. | addition material | composición de aporte |
| transp. | addition of a wagon | agregación |
| transp. | addition of a wagon | agregación de un vagón |
| tech., chem. | addition of exogenous sugars | adición de azúcares exógenos |
| ed., IT | addition of harmony | adición de armonía |
| chem., el. | addition of lifts | adición de anillos |
| environ. | addition of mercury bichloride employed as a carrier | adición de bicloruro de mercurio utilizado como portador |
| agric. | addition of phosphate | fosfatado |
| gen. | addition of small amounts | adición de cantidades pequeñas |
| agric., sugar. | addition of sucrose in aqueous solution | práctica del azucarado aguado |
| agric., sugar. | addition of sucrose in aqueous solution | adición de sacarosa en solución acuosa |
| agric. | addition of sugar | edulcoración |
| agric. | addition of sugar | azucarado |
| hobby, agric. | addition of tannin | tanizado |
| chem. | addition of titrant | adición del valorante |
| chem. | addition of titrant | adición del valorador |
| math. | addition of variates | adición de variables |
| math. | addition of vectors | adición de vectores |
| comp., MS | addition operator | operador de adición (The + character, used to indicate addition or a positive number) |
| environ. | addition polymer | polímero adicional |
| textile | addition polymer | polimero de adición |
| environ. | addition polymer A polymer formed by the chain addition of unsaturated monomer molecules, such as olefins, with one another without the formation of a by-product, as water; examples are polyethylene, polypropylene and polystyrene | polímero adicional |
| chem. | addition polymerisation | polimerización por adición |
| textile | addition polymerization | polimerización por adición |
| math. | addition problem | problema de suma (Use suma if speaking of a numerical problem such as 2 + 7 = ?; use problema de suma if speaking of a word problem) |
| chem. | addition reaction | reacción por adición |
| life.sc. | addition required to convert from orthometric to dynamic height | corrección dinámica vertical |
| stat. | addition rule | regla de la adición |
| math. | addition sentence | suma |
| math. | addition sign | signo mas |
| math. | addition story | problema de suma |
| math. | addition story | cuento de suma |
| math. | addition tables | tablas de suma |
| IT, dat.proc. | addition time | tiempo de suma |
| IT, dat.proc. | addition time | tiempo de adición |
| insur. | addition to age | incremento de la tasa por edad |
| commun., IT | addition to ring | incorporación al anillo |
| patents. | addition to the action | complemento de la acción |
| patents. | addition to the patent claim | complemento de la reivindicación |
| account. | addition to the value of non-produced non-financial assets | aumentos del valor de los activos no financieros no producidos , |
| IT | addition without carry | operación O exclusiva |
| IT | addition without carry | operación de no equivalencia |
| agric. | after addition of the customs duty | ... incrementado con la incidencia del derecho de aduana |
| genet. | alien addition line | línea de adición extraespecífica |
| met. | austenites with a nitrogen addition agent | austenita con adición de nitrógeno |
| IT, dat.proc. | automatic addition of form pages | adición automática de páginas de formulario |
| IT, dat.proc. | Carlos addition for clustered terminal user agents | ampliación de CARLOS para agentes de usuario terminal agrupados |
| chem. | chemical addition system | sistema de adición química |
| chem. | chemical addition tank | tanque de adición química |
| food.ind. | fresh grape must with fermentation arrested by the addition of alcohol | mosto de uva fresco apagado con alcohol |
| agric. | grape must with fermentation arrested by the addition of alcohol | mosto apagado con alcohol |
| agric. | grape must with fermentation arrested by the addition of alcohol | mosto de uva apagado con alcohol |
| agric. | grape must with fermentation arrested by the addition of alcohol | mosto de uva estrujada apagado con alcohol |
| econ. | hours worked in addition to those worked during normal working hours | horas trabajadas además de las realmente trabajadas durante los períodos normales de trabajo |
| econ. | income in addition to normal pay | renta no salarial |
| patents. | main ware and the addition given into the bargain | mercancía principal y añadidura |
| patents. | main ware and the addition given into the bargain | mercancía principal y yapa |
| IT | microprocessor addition time | tiempo de adición del microprocesador |
| transp. | non-addition rule | regla de no inscripción |
| gen. | poison addition system | sistema de adición de veneno |
| commun., IT | power-addition law | ley de suma en potencia |
| commun., IT | power-addition law | ley de suma de potencia |
| earth.sc. | progressive-addition bifocal | lente bifocal progresiva |
| math. | related addition and subtraction facts | operaciones relacionadas de suma (y resta) |
| met. | stabilisation of the austenite structure by means of nitrogen addition agents | estabilización de la estructura austenítica por adición de agentes nitrogenados |
| patents. | subsequent addition of a new product to the specification of goods | la adición ulterior de un nuevo producto a la lista |
| met. | the addition of aluminium causes considerable grain refinement | la adición de aluminio tiene un afinado importante del grano |
| stat., scient. | variance addition law | ley de la suma de las variancias |
| chem. | water with addition of acids | agua acidulada |