| mecachis | damn it |
| Mecachrome | Mecachrome |
| mecanica | mechanics |
| mecanico | mechanical |
| mecanismo | apparatus |
| Mecanismo de Anticitera | Antikythera mechanism |
| Mecanismo de cuatro barras | Four bar linkage |
| mecanismo de defensa | defense mechanism |
| Mecanismo de Higgs | Higgs mechanism |
| mecanismo de precisión | clockwork |
| Mecanismo de radiación | Radiation mechanisms |
| Mecanismo de reacción | Reaction mechanism |
| mecanismo de relojería | clockwork |
| Mecanismo Euler-Liljestrand | Euler-Liljestrand mechanism |
| mecanización | mechanization |
| mecanizar | mechanize |
| Mecano | Erector Set |
| mecanografiado | typewritten |
| mecanografiar | type |
| mecanografiar al tacto | touch-type |
| mecanografía | typing |
| mecanógrafa | typist |
| mecanógrafo | typist |
| mecate | string |
| Mecca-Cola | Mecca-Cola |
| Meccano | Meccano |
| mecedora | rocker |
| mecer | dandle |
| mecha | match |
| mecha de lado | sidelock |
| mechero | burner |
| Mechero Bunsen | Bunsen burner |
| mechón | tuft |
| mechón de pelo | forelock |
| Mecio Fufecio | Mettius Fufetius |
| Meckenheim | Meckenheim |
| Mecklemburgo | Mecklenburg |
| Mecklemburgo-Pomerania Occidental | Mecklenburg-Vorpommern |
| Mecoptera | Mecoptera |
| mecánica | mechanics |
| Mecánica celeste | Celestial mechanics |
| Mecánica clásica | Classical mechanics |
| Mecánica cuántica | Quantum mechanics |
| Mecánica de fluidos | Fluid mechanics |
| Mecánica de juego | Game mechanic |
| mecánica de precisión | precision engineering |
| Mecánica de sólidos deformables | Solid mechanics |
| Mecánica estadística | Statistical mechanics |
| Mecánica hamiltoniana | Hamiltonian mechanics |
| Mecánica lagrangiana | Lagrangian mechanics |
| Mecánica relativista | Relativistic mechanics |
| Mecánicas de fluidos | Fluid mechanics |
| mecánico | mechanic |
| mecánico del servicio de carreteras | AAA attendant |
| mecánico dental | dental technician |
| Mecбnica clбsica | Classical mechanics |
| Medabots | Medabots |
| medalla | medal |
| Medalla Belisario Domínguez del Senado de la República | Belisario Domínguez Medal of Honor |
| Medalla Bruce | Bruce Medal |
| Medalla Caldecottl | Caldecott Medal |
| Medalla Copley | Copley Medal |
| Medalla Davy | Davy Medal |
| Medalla de Honor | Medal of Honor |
| Medalla de oro de la Real Sociedad Astronómica | Gold Medal of the Royal Astronomical Society |
| medalla de plata | silver |
| Medalla de San Benito | Saint Benedict Medal |
| Medalla Eddington | Eddington Medal |
| Medalla Fields | Fields Medal |
| Medalla Goethe | Goethe Medal |
| Medalla James Craig Watson | James Craig Watson Medal |
| Medalla John Bates Clark | John Bates Clark Medal |
| Medalla John von Neumann | IEEE John von Neumann Medal |
| Medalla linneana | Linnean Medal |
| Medalla Nansen | Nansen Refugee Award |
| Medalla Rumford | Rumford Medal |
| Medalla Wollaston | Wollaston Medal |
| Medallero de los Juegos Olímpicos | Total Olympics medal count |
| Medallero de los Juegos Olímpicos de Invierno | Winter Olympics medal count |
| Medallero de los Juegos Olímpicos de Verano | Summer Olympics medal count |
| medallista | medalist |
| Medallistas olímpicos en baloncesto | List of Olympic medalists in basketball |
| medallón | medallion |
| Medan | Medan |
| Medardo | Madard |
| Medea | Medea |
| Medef | Mouvement des Entreprises de France |
| Medeglia | Medeglia |
| Medel | Medel |
| Medeljino | Medellín |
| Medellín | Medellín |
| Medelpad | Medelpad |
| Medenine | Medenine Governorate |
| Medgidia | Medgidia |
| media | sock |
| media altura | half-height |
| Media aritmética | Arithmetic average |
| Media aritmética geométrica | Arithmetic-geometric mean |
| media asta | half-mast |
| Media Center portátil | Portable Media Center |
| media de vida | half-life |
| media estación | in-between season |
| Media generalizada | Generalized mean |
| media geométrica | geometric mean |
| media hora | half-hour |
| media luna | half moon |
| Media Luna Roja | Red Crescent |
| media luz | half-light |
| media naranja | better half |
| media paga | half pay |
| media volea | half-volley |
| media vuelta | about-face |
