Reciprocal describes something that's the same on both sides. If you and your sister are in a big fight on a long car trip, you might resolve it through a reciprocal agreement that you'll stop poking her and she'll stop reading road signs out loud.

The word mutual is a near synonym in most uses: reciprocal/mutual friendship, describing, a relationship in which two people feel the same way about each other, or do or give similar things to each other. If you tell someone you like them and they say, "The feelings are reciprocal," that means they like you too. In math, a reciprocal is a number that when multiplied by a given number gives one as a product.

Definitions of reciprocal
  1. adjective
    concerning each of two or more persons or things; especially given or done in return
    reciprocal aid”
    reciprocal trade”
    reciprocal privileges at other clubs”
    synonyms: mutual
    affecting or undertaken by two parties
    involving three parties
    expressing a reciprocal or complementary relation
    interactional, interactive
    capable of acting on or influencing each other
    reciprocative, reciprocatory
    moving alternately backward and forward
    reciprocative, reciprocatory
    given or done or owed to each other
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    not reciprocal
    not moving alternately forward and backward
    unanswered, unreciprocated, unrequited
    not returned in kind
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  2. noun
    something (a term or expression or concept) that has a reciprocal relation to something else
    “risk is the reciprocal of safety”
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    type of:
    reciprocality, reciprocity
    a relation of mutual dependence or action or influence
  3. noun
    (mathematics) one of a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2; the multiplicative inverse of 7 is 1/7
    synonyms: multiplicative inverse
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    type of:
    inverse, opposite
    something inverted in sequence or character or effect
  4. adjective
    of or relating to the multiplicative inverse of a quantity or function
    “the reciprocal ratio of a:b is b:a”
    opposite in nature or effect or relation to another quantity
  5. noun
    hybridization involving a pair of crosses that reverse the sexes associated with each genotype
    synonyms: reciprocal cross
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    type of:
    cross, crossbreeding, crossing, hybridisation, hybridization, hybridizing, interbreeding
    (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
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