Reciprocal pronoun
WordNet
noun
(1) A pronoun or pronominal phrase (as `each other') that expresses a mutual action or relationship between the individuals indicated in the plural subject
"The sentence `They cared for each other' contains a reciprocal pronoun"
WiktionaryText
Noun
- a pronoun referring to an antecedent in the plural, and expressing a mutual relation
- The English reciprocal pronouns are each other and one another.