the eldest daughter of a king or queen.
(in Great Britain and, formerly, Prussia) an eldest princess to whom this title has been granted for life by the sovereign.
Origin of princess royal
First recorded in 1640–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the eldest daughter of a British or (formerly) a Prussian sovereign: a title not always conferred
(capitals) the title of Princess Anne
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012