re·cip·ro·cate 
(rĭ-sĭprə-kāt′)
(rĭ-sĭprə-kāt′)v. re·cip·ro·cat·ed, re·cip·ro·cat·ing, re·cip·ro·cates
v.tr.
1. To give or take mutually; interchange: The friends reciprocated favors.
2. To show, feel, or give in response or return: They opened their hearts to her, and she reciprocated their affection.
v.intr.
1. To give and take something mutually.
2. To make a return for something given or done.
3. To move back and forth alternately: a power saw that reciprocates.
[Latin reciprocāre, reciprocāt-, to move back and forth, from reciprocus, alternating; see RECIPROCAL.]
re·cipro·ca′tive adj.
re·cipro·ca′tor n.