What is "reciprocal pronoun"

n. a pronoun referring to an antecedent in the plural, and expressing a mutual relation

n. 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"

Reciprocal pronouns are a type of pronoun which can be used to refer to a noun phrase mentioned earlier in a sentence. The reciprocal pronouns found in English are one another and each other, and they form the category of anaphors along with reflexive pronouns (myself, yourselves, etc.).