| Subject | English | Spanish |
| el. | earth flattening method | método de alisamiento de la Tierra |
| avia. | flatten out | aplastar |
| tech. | flatten out | enderezar |
| transp. | flatten-out | enderezar |
| avia. | flatten out | salir de picado |
| avia. | flatten out | aplanar |
| mater.sc., mech.eng. | flattened can | bote plegable |
| pack. | flattened can | bote plegable (packaged flat, embalado en forma plegada) |
| comp., MS | flattened interface | interfaz plana (An interface created to combine members of multiple interfaces) |
| nat.sc., agric. | flattened meadow grass | poa chata (Poa compressa L.) |
| nat.sc., agric. | flattened meadow grass | poa comprimida (Poa compressa L.) |
| comp., MS | flattened rowset | conjunto de filas planas (A multidimensional data set presented as a two-dimensional rowset in which unique combinations of elements of multiple dimensions are combined on an axis) |
| industr., construct., met. | flattening kiln | plaza de aplanado |
| mech.eng. | flattening machine | máquina para aplanar |
| commun. | flattening or rounding machine | máquina para aplanar o redondear los lomos |
| transp. | flattening profile | perfil de aplastamiento |
| industr., construct., met. | flattening table | piedra de aplanado |
| transp. | flattening test | prueba de aplastamiento |
| met. | flattening test | ensayo de aplastamiento |
| industr., construct., met. | flattening tool | plancha de madera |
| mech.eng. | flattening unlocking and locking tool | frenador-desfrenador aplanador |
| mech.eng. | flattening unlocking and locking tool | frenador y desfrenador aplanador |
| industr., construct., chem. | foot-flattening machine | máquina para formar los pies |
| gen. | fuel flattening | revestimiento abatido |
| gen. | fuel rod flattening | revestimiento abatido |
| industr. | machine-tool for working metal by flattening | prensa para aplanar |
| agric. | slightly flattened germ | granos ligeramente aplastados |
| agric., industr. | stem flattening | laminado de las venas |
| met. | straightening and flattening machine | máquina para enderezar |
| met. | straightening and flattening machine | máquina para aplanar |
| mech.eng. | table for flattening by drawing | banco de aplanar por estirado |