- reciprocal
**reciprocal**[ri sip′rə kəl]__adj.__[< L*reciprocus,*returning, reciprocal < **reco-prokos,*backwards and forwards < **recos*(<*re-*, back + **cos*< ?) + IE **proko-,*ahead (> Gr*proka*, forthwith) < base **pro-,*forward, ahead + -AL]**1.**done, felt, given, etc. in return [hoping for a reciprocal favor]**2.**present or existing on both sides; each to the other; mutual [to feel a reciprocal affection]**3.**corresponding but reversed or inverted**4.**equivalent or interchangeable; corresponding or complementary**5.***Gram.*expressing mutual action or relation [“each other” is traditionally called a reciprocal pronoun]**6.***Math.*of the reciprocals of quantities, or their relations__n.__**1.**anything that has a reciprocal action on or relation to another; complement, counterpart, equivalent, etc.**2.***Math.*the quantity resulting from the division of 1 by the given quantity; quantity which multiplied by the given quantity equals 1 (Ex.: the*reciprocal*of 7 is^{1}/_{7}, of^{1}/_{7}is 7)SYN.- MUTUALreciprocality [ri sip′rəkal′ə tē]__n.__reciprocally__adv.__

*English World dictionary.
V. Neufeldt.
2014.*