n. (as a title usu. Princess) 1 the wife of a prince. 2 a female member of a royal family other than a reigning queen. 3 (in full princess of the blood) a daughter or granddaughter of a British monarch. 4 a pre-eminent woman or thing personified as a woman. Princess Regent 1 a princess who acts as regent. 2 the wife of a Prince Regent. Princess Royal a monarch's eldest daughter, as a title conferred by the monarch.
[ ME f. OF princesse (as PRINCE) ]