prin·cess /ˈprɪn(t)səs, ˈprɪnˌsɛs, || prɪnˈsɛs/
1. A female prince; a woman having sovereign power, or the rank of a prince.
So excellent a princess as the present queen. --Swift.
2. The daughter of a sovereign; a female member of a royal family.
3. The consort of a prince; as, the princess of Wales.
Princess royal, the eldest daughter of a sovereign.
n : a female member of a royal family other than the queen
(especially the daughter of a sovereign)