Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: reciprocus 'returning the same way', from re- 'back' + pro- 'forward'

reciprocal

adjective
     
re‧cip‧ro‧cal formal
a reciprocal arrangement or relationship is one in which two people or groups do or give the same things to each other [↪ mutual]:
He spoke of the necessity for a reciprocal relationship that would be useful for all sides.
Such treaties provide reciprocal rights and obligations.
reciprocally adverb

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