| principal office | Zentralverwaltung |
| principal parts | Stammzeiten |
| principal place of business | Hauptverwaltung |
| principal places of business | Hauptverwaltungen |
| principal plane | Hauptebene |
| principal planes | Hauptebenen |
| principal point | Bildmittelpunkt |
| principal prosecution witness | Hauptbelastungszeuge |
| principal purpose | Hauptzweck |
| principal quantum number | Hauptquantenzahl |
| principal question | Hauptfrage |
| principal residence | Hauptwohnsitz |
| Principal shareholder | Hauptaktionär |
| principal shareholders | Hauptaktionäre |
| principal source | Hauptquelle |
| principal strain | Hauptdehnung |
| principal stress | Hauptspannung |
| principal stress axis | Hauptspannungsachse |
| principal stress axiss | Hauptspannungsachsen |
| principal supplier | Hauptlieferant |
| principal suppliers | Hauptlieferanten |
| principal tectonic | syntektonisch |
| principal temple | Haupttempel |
| principal terminal | Hauptstromanschluß |
| principal theme | Hauptthema |
| principal themes | Hauptthemen |
| principal violinist | Primgeiger |
| principal voltage | Hauptspannung |
| principal witness | Kronzeuge |
| principal's office | Direktorat |
| Principal-agent problem | Prinzipal-Agent-Theorie |
| principality | Fürstentum |
| Principality of Abkhazia | Liste der Herrscher von Abchasien |
| Principality of Achaea | Fürstentum Achaia |
| Principality of Albania | Fürstentum Albanien |
| Principality of Andorra | Andorra |
| Principality of Anhalt-Aschersleben | Anhalt-Aschersleben |
| Principality of Anhalt-Bernburg | Anhalt-Bernburg |
| Principality of Ansbach | Fürstentum Ansbach |
| Principality of Antioch | Fürstentum Antiochia |
| Principality of Auersperg | Auersperg |
| Principality of Bayreuth | Fürstentum Bayreuth |
| Principality of Bulgaria | Fürstentum Bulgarien |
| Principality of Capua | Fürstentum Capua |
| Principality of Catalonia | Katalonien |
| Principality of Freedonia | Freedonia |
| Principality of Hutt River | Hutt River Province |
| Principality of Kastrioti | Fürstentum Kastrioti |
| Principality of Liechtenstein | Liechtenstein |
| Principality of Lippe | Lippe |
| Principality of Moldavia | Fürstentum Moldau |
| Principality of Monaco | Fürstentum Monaco |
| Principality of Montenegro | Fürstentum Montenegro |
| Principality of Moscow | Fürstentum Moskau |
| Principality of Nitra | Neutraer Fürstentum |
| Principality of Orange | Fürstentum Orange |
| Principality of Pindus and Voivodship of Macedonia | Fürstentum von Pindos und Mazedonien |
| Principality of Salerno | Fürstentum Salerno |
| Principality of Salm | Fürstentum Salm |
| Principality of Samos | Fürstentum Samos |
| Principality of Sealand | Sealand |
| Principality of Seborga | Seborga |
| Principality of Taranto | Fürstentum Tarent |
| Principality of Theodoro | Fürstentum Theodoro |
| Principality of Walachia | Fürstentum Walachei |
| Principality of Wales | Fürstentum Wales |
| Principality of Wallachia | Fürstentum Walachei |
| Principality of Zeta | Zeta |
| principally | grundsätzlich |
