fourth person

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun grammar A variety of the third person sometimes used for indefinite referents, such as one in one shouldn't do that.
• noun 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.