| threat | amenaza |
| threaten | amenazar |
| threaten with | amenazar con |
| threatened | amenazado |
| Threatened species | Especies amenazadas |
| threatening | amenazador |
| threateningly | amenazantemente |
| three | tres |
| Three August Ones and Five Emperors | Tres augustos y cinco emperadores |
| Three Blind Mice and Other Stories | Tres ratones ciegos y otras historias |
| Three body problem | Problema de tres cuerpos |
| Three Cheers for Sweet Revenge | Three Cheers For Sweet Revenge |
| Three color photometry | Fotometría con tres colores |
| Three Crowns | Three Crowns |
| Three Days Grace | Three Days Grace |
| Three domain system | Dominio |
| Three Gorges Dam | Presa de las Tres Gargantas |
| three hundred | trescientos |
| Three Kingdoms | Tres Reinos |
| Three Kingdoms of Korea | Tres Reinos de Corea |
| Three Kings | Tres reyes |
| Three Knights Opening | Apertura de los tres caballos |
| Three Laws of Robotics | Tres leyes de la robótica |
| Three Little Pigs | Los tres cerditos |
| Three marks of existence | Tri-Laksana |
| Three Men and a Comic Book | Three Men And A Comic Book |
| Three Mile Island accident | Three Mile Island |
| Three Mile Island Nuclear Generating Station | Three Mile Island |
| Three Musketeers | Los tres mosqueteros |
| Three Pure Ones | Los Tres Puros |
| three quarters | tres cuartos |
| Three Represents | Triple Representatividad |
| Three Rings | Anillo de poder |
| Three Rural Issues | Los tres problemas rurales |
| Three Secrets of Fatima | Misterios de Fátima |
| Three Sovereigns and Five Emperors | Tres augustos y cinco emperadores |
| Three Stooges | Los tres chiflados |
| Three wise monkeys | Los tres monos sabios |
| Three-age system | Tres edades |
| Three-awn | Aristida |
| three-cornered | triangular |
| three-dimensional | tridimensional |
| Three-domain system | Dominio |
| three-headed | tricéfalo |
| Three-phase AC | Sistema trifásico |
| Three-phase alternating current | Sistema trifásico |
| Three-phase electric power | Sistema trifásico |
