1) Mutual 2) Reciprocal 3) Reciprocatory 1) Reciprocal 2) Reciprocatory 
• (p. pr. & vb. n.) of Reciprocate
[adj] - moving alternately backward and forward
reciprocating 1. Interchanging; each person or group giving or doing to the other the same thing; to give, to feel, etc., in return. 2. To give and to receive reciprocally; to interchange; such as, to reciprocate favors. 3. To cause or to move alternately backward and forward. 4. To make a return, as for something given. 5. To move alternately ...
reciprocatory adjective moving alternately backward and forward