Определение fourth person в Английский Язык Английский Язык словарь
A variety of the third person sometimes used for indefinite referents, such as one in one shouldn't do that
In some languages such as Ojibwe, a variety of the third person used for a secondary, or obviative, third person
The man saw the dog as he was leaving. (if he is the third person, or proximate, it refers to the man; if he is the fourth person, or obviative, it refers to the dog).