• IPA: /ɹɪˈsɪpɹək(ə)l/

reciprocal (not comparable)

1. Of a feeling, action or such: mutual, uniformly felt or done by each party towards the other or others; two-way.

   reciprocal love; reciprocal duties

   • c. 1603–1606, William Shakespeare, “The Tragedie of King Lear”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act IV, scene vi]:

     Let our reciprocal vows be remembered.

2. Mutually interchangeable.

   • These two rules will render a definition reciprocal with the thing defined.

3. (grammar) expressing mutual action, applied to pronouns and verbs; also in a broad sense: reflexive
4. (math) Used to denote different kinds of mutual relation; often with reference to the substitution of reciprocals for given quantities.
5. Done, given, felt, or owed in return

   a reciprocal invitation to lunch

• mutual, two-way
• contrary, opposite, converse, inverse, inverted, cross
• (grammar) reflexive
• See also Thesaurus:contrary

• reciprocity

• French: réciproque
• German: gegenseitig, reziprok
• Portuguese: recíproco
• Russian: взаи́мный
• Spanish: mutuo, recíproco

• German: entgegengesetzt, umgekehrt
• Russian: обра́тный
• Spanish: al revés

reciprocal (plural reciprocals)

1. (arithmetic) The number obtained by dividing 1 by another given number; the result of exchanging the numerator and the denominator of a fraction.

   0.5 is the reciprocal of 2.

2. (grammar) A construction expressing mutual action.
   • 2008, Ekkehard König, ‎Volker Gast, Reciprocals and Reflexives: Theoretical and Typological Explorations

     Depending on where reciprocalization applies (syntax vs. lexicon), the relevant reciprocal verbs are claimed to exhibit specific properties, in particular: (i) syntactic reciprocals are fully productive whereas lexical reciprocals have only limited productivity; […]

• (in arithmetic) multiplicative inverse

• French: inverse
• German: Kehrwert
• Portuguese: recíproca