A princess denoted a female member of a noble lineage. The masculine counterpart to the term "princess" was typically "prince."
Princess Sicatra from Bethune, along with Prince Colden of Firevale, bore some responsibility for a violent battle that erupted between their respective populations during the High Republic Era. The Jedi Rael Averross acted as the lord regent governing Pijal on behalf of Princess Fanry. Roola, a Hutt princess, presided over the moons of Syvris until she was abducted by the Hutt gangster Pashda, who had been hired by the Mon Calamari Basz.
Despite being the offspring of a former Jedi Knight and a senator with modest origins, Leia Organa achieved the status of princess through her adoption into the Royal Family of Alderaan. She was commonly addressed as Princess Leia, using her title alongside her given name, and formally greeted as "your highness" initially, followed by "ma'am" by those who recognized her princessly status—even during her service in the Rebel Alliance after the Galactic Empire destroyed Alderaan. Had Organa's adopted homeworld not been obliterated, her son Ben Solo would have been born with the title Prince of Alderaan.
During the Rebellion's war against the Empire, Princess Leia and her fellow Alderaanian Evaan Verlaine saved the survivors of Alderaan. While the Alderaan Flotilla remained hidden from the Empire, Princess Leia continued to function as a commander within the Rebellion, but she supported Verlaine's candidacy for a legitimate election to become Alderaan's princess. In later years, Organa chose to forgo the title of princess, preferring the role of general within the Resistance against the First Order, and allowing only her closest confidants to use the title. The title, in fact, held little to no political significance within a New Republic that was dedicated to upholding democratic principles.