/ rɪˈsɪprəkl; NAmE / adjective
involving two people or groups who agree to help each other or behave in the same way to each other :
The two colleges have a reciprocal arrangement whereby students from one college can attend classes at the other.
► re·cip·ro·cal·ly / -kli; NAmE / adverb
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WORD ORIGIN
late 16th cent.: from Latin reciprocus (based on re- back + pro- forward) + -al .