| main roof break | Hangendriss |
| main rotor | Hauptrotor |
| main rotor hub assy | Hauptrotorkopf |
| main rotor mast assy | Hauptrotormast |
| main rotors | Hauptrotoren |
| main route | Hauptstrecke |
| main routes | Hauptstrecken |
| main routine | Hauptroutine |
| main running line | Hauptgleis |
| main runway | Hauptbahn |
| main runway for landing | Haupt-Landebahn |
| main runway for landings | Haupt-Landebahn |
| main runway for take-off | Haupt-Startbahn |
| main runway for take-offs | Haupt-Startbahn |
| main runway for takeoff | Haupt-Startbahn |
| main runway for takeoffs | Haupt-Startbahn |
| main sail | Großsegel |
| main scale | Hauptskala |
| main section | Hauptabschnitt |
| Main Security Office of the Reich | Reichssicherheitshauptamt , RSHA |
| main sentence | Hauptsatz |
| Main sequence | Hauptreihe |
| main sewer | Sammler |
| main share of the blame | Hauptschuld |
| main shell | Hauptschale |
| main shock | Hauptbeben |
| main shopping street | Haupteinkaufsstraße |
| main shut-off device | Hauptabschaltvorrichtung |
| main shutoff cock | Hauptabsperrhahn |
| main silencer | Hauptschalldämpfer |
| main source | Hauptquelle |
| main source of revenue | Haupteinnahmequelle |
| main sources | Hauptquellen |
| main spar | Hauptholm |
| main spindle, work spindle | Hauptspindel |
| main spring | Aufzugfeder |
| main spring cover | Federdeckscheibe |
| main spring covers | Federdeckscheiben |
| main spring winder | Federwinder |
| main spring winders | Federwinder |
| main springs | Aufzugfedern |
| main squirt | Gautschknecht |
| main squirts | Gautschknechte |
| main stage | Hauptstufe |
| main stage engine | Hauptstufentriebwerk |
| main stairs | Haupttreppe |
| Main stalk | Rasterfahndung |
| main stand | Haupttribüne |
| main statement | Kernaussage |
| main statements | Kernaussagen |
| main station | Hauptanschluß |
| main station for fixed connection | Hauptanschluss für Direktruf |
| main station line | Hauptanschluß |
| main stations | Hauptbahnhöfe |
| main steam | Frischdampf |
| main steam exhaust connection | Abdampfverbindung |
| main steam line | Frischdampfleitung |
| main steeple | Hauptturm |
| main storage | Arbeitsspeicher |
| main storage address | Hauptspeicheradresse |
| main street | Hauptstraße |
| main streets | Haupteinkaufsstraßen |
| main stretch | Hauptabschnitt |
| main structural component | Hauptbaugruppe |
| main structural components | Hauptbaugruppen |
| main studio | Hauptstudio |
