Noun
(grammar) A variety of the third person sometimes used for indefinite referents, such as one, as in one shouldn't do that.
(linguistics) grammatical person in some languages distinct from first, second, and third persons, semantically translated by one of them in English. For example, in Ojibwe, it is 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)
“AMAZING,” a fourth person declared in all-caps, also adding several of the fire emoji for further emphasis. Source: Internet
A fourth person, a woman in her 20s, was taken to hospital with injuries not considered life-threatening. Source: Internet
Esparza is the fourth person to plead guilty to federal charges in the past two months; the other two are Justin Kim, a real estate consultant and fundraiser, and former District 12 Councilman Mitch Englander. Source: Internet
In that respect, it could be described as a "fourth person", since there is no way of connecting the action performed with a particular agent (except for some nonstandard forms; see below). Source: Internet
In Cincinnati, police said three people were wounded in a single 2 a.m. shooting and a fourth person was wounded in another shooting at 2:30 a.m. In Akron, police were investigating the fatal shooting of a man reported about 10:30 p.m. Source: Internet
!” a fourth person wrote. Source: Internet