/ rɪˈsɪprəkeɪt; NAmE / verb
1.
reciprocate (sth) (with sth) to behave or feel towards sb in the same way as they behave or feel towards you :
[ vn ]
Her passion for him was not reciprocated.
He smiled but his smile was not reciprocated.
[ v ]
I wasn't sure whether to laugh or to reciprocate with a remark of my own.
2.
[ v ] ( technical ) to move backwards and forwards in a straight line :
a reciprocating action
► re·cip·ro·ca·tion / rɪˌsɪprəˈkeɪʃn; NAmE / noun [ U ]
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WORD ORIGIN
late 16th cent.: from Latin reciprocat- moved backwards and forwards, from the verb reciprocare , from reciprocus (based on re- back + pro- forward).