reciprocal
US /rɪˈsɪp.rə.kəl/
UK /rɪˈsɪp.rə.kəl/
1.
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a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.
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the compressibility is the reciprocal of the bulk modulus
2.
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a pronoun or verb expressing mutual action or relationship, e.g. each other, fight.
1.
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given, felt, or done in return.
:
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she was hoping for some reciprocal comment or gesture
2.
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(of an agreement or obligation) bearing on or binding each of two parties equally.
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the treaty is a bilateral commitment with reciprocal rights and duties