The eldest daughter of a reigning monarch (especially as a title conferred by the British monarch)
（尤指英国君主授予的头衔）长公主
as titlethere was an official opening by the Princess Royal
Example sentencesExamples
Born Princess Anne in 1950, she received the title Princess Royal from The Queen in June 1987.
The Princess Royal is a lifetime title (i.e., not hereditary), bestowed only upon the eldest daughter of the Sovereign, but entirely at the Sovereign's discretion.
Definition of Princess Royal in US English:
Princess Royal
nounˈprɪnsɪs
The eldest daughter of a reigning monarch (especially as a title conferred by the British monarch)
（尤指英国君主授予的头衔）长公主
as titlethere was an official opening by the Princess Royal
Example sentencesExamples
Born Princess Anne in 1950, she received the title Princess Royal from The Queen in June 1987.
The Princess Royal is a lifetime title (i.e., not hereditary), bestowed only upon the eldest daughter of the Sovereign, but entirely at the Sovereign's discretion.