The reciprocal pronouns in English are one another and each other. Together with the reflexive pronoun

s — myself, yourself, ourselves, yourselves, and others — they are classified as anaphors

Anaphora (linguistics)

In linguistics, anaphora is an instance of an expression referring to another. Usually, an anaphoric expression is represented by a pro-form or some other kind of deictic--for instance, a pronoun referring to its antecedent...

.

Reciprocity

Reciprocity

Reciprocity may refer to:*Reciprocity , used to describe the concept of free trade with the United States of America** Reciprocal trade agreement, entered into in order to reduce tariffs, quotas and other trade restrictions on items traded between the signatories*Reciprocity , the relationship...

 is the broader concept, of which reflexivity

Reflexive

Reflexive may refer to:In fiction:*MetafictionIn grammar:*Reflexive pronoun, a pronoun with a reflexive relationship with its self-identical antecedent*Reflexive verb, where a semantic agent and patient are the same...

 is a special case. Reciprocity has A relating to B and B relating in exactly the same way to A. Reflexivity is the concept of A reciprocating with itself.

• Reciprocal: A↔B = A→B and A←B = A→B and B→A
• Reflexive: A↔A = A→A and A←A = A→A and A→A = simply A→A

Examples:

• Reciprocal: They all said "Hello" to one another.
• Reflexive: All alone, he had no friends but himself.

The classical Greek reciprocal pronoun was allēlōn
(ἀλλἠλων). From this stems the word parallel: para allēlois (παρὰ ἀλλήλοις) "beside each other".

See also

• Reciprocal (grammar)
  Reciprocal (grammar)
  A reciprocal is a linguistic structure that marks a particular kind of relationship between two noun phrases. In a reciprocal construction, each of the participants occupies both the role of agent and patient with respect to each other...
  
  
• Reflexive pronoun
  Reflexive pronoun
  A reflexive pronoun is a pronoun that is preceded by the noun, adjective, adverb or pronoun to which it refers within the same clause. In generative grammar, a reflexive pronoun is an anaphor that must be bound by its antecedent...